feat: 媒体库 blob 去重存储与品牌/注册等前端调整

新增：
- blob_store 二进制去重存储 + blob_dedup 测试

其它：
- 后端 settings/auth/media_library/upload/operations 服务与 handler 调整
- 前端品牌（BrandLockup/BrandCropModal/BrandSeoPanel）、注册、媒体库、分析详情页、Header/SiteChrome 等更新

frontend/components/BrandCropModal.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { useCallback, useEffect, useRef, useState } from "react";
+import { useCallback, useEffect, useRef, useState, type CSSProperties } from "react";
 import Cropper, { type Area } from "react-easy-crop";
 import "react-easy-crop/react-easy-crop.css";
 import {
@@ -10,29 +10,25 @@ import {
   apiMyMedia, apiUploadBrand,
   type MediaAttachment,
 } from "@/lib/api";
-import { getCroppedBrandWebp } from "@/lib/cropImage";
+import { getCroppedBrandWebp, getFullBrandWebp } from "@/lib/cropImage";
 import Modal from "@/components/Modal";
-import { brandFileOk, type BrandSlot, type BrandLogoSize } from "@/lib/brand";
+import BrandLockup from "@/components/BrandLockup";
+import { AdminSegmented } from "@/components/admin";
+import {
+  BRAND_LOGO_FITS,
+  BRAND_LOGO_SIZES,
+  BRAND_LOGO_SIZE_ASPECT,
+  brandFileOk,
+  brandLogoBox,
+  suggestLogoSize,
+  type BrandLogoFit,
+  type BrandLogoSize,
+  type BrandSlot,
+} from "@/lib/brand";
 
 // 源文件大小保护（防止手机相册原图撑爆浏览器内存；最终限制以裁剪后 2MB 为准）
 const SOURCE_MAX_BYTES = 15 * 1024 * 1024;
 
-// 品牌图槽位到默认裁剪比例的映射
-const SLOT_ASPECT: Record<BrandSlot, number> = {
-  logo_light: 1,   // 方标 1:1
-  logo_dark: 1,    // 方标 1:1
-  favicon: 1,      // Favicon 1:1
-};
-
-// 品牌图比例选项（与 BRAND_LOGO_SIZES 对应）
-const ASPECT_OPTIONS: { id: BrandLogoSize; label: string; aspect: number }[] = [
-  { id: "sq", label: "1:1", aspect: 1 },
-  { id: "2x1", label: "2:1", aspect: 2 },
-  { id: "3x1", label: "3:1", aspect: 3 },
-  { id: "4x1", label: "4:1", aspect: 4 },
-  { id: "16x9", label: "16:9", aspect: 16 / 9 },
-];
-
 interface BrandCropModalProps {
   open: boolean;
   slot: BrandSlot;
@@ -45,10 +41,19 @@ interface BrandCropModalProps {
   seedUrl?: string;
   /** 已消费 seedFile / seedUrl */
   onSeedConsumed?: () => void;
+  /** 当前显示画幅（与工具栏同源，受控） */
+  logoSize?: BrandLogoSize;
+  /** 当前铺法（与工具栏同源，受控） */
+  logoFit?: BrandLogoFit;
+  /** 画幅变更回调（同步到父组件工具栏） */
+  onSizeChange?: (size: BrandLogoSize) => void;
+  /** 铺法变更回调（同步到父组件工具栏） */
+  onFitChange?: (fit: BrandLogoFit) => void;
 }
 
 export default function BrandCropModal({
   open, slot, onClose, onCropped, seedFile, seedUrl, onSeedConsumed,
+  logoSize = "sq", logoFit = "contain", onSizeChange, onFitChange,
 }: BrandCropModalProps) {
   const [media, setMedia] = useState<MediaAttachment[]>([]);
   const [imageSrc, setImageSrc] = useState<string | null>(null);
@@ -56,11 +61,18 @@ export default function BrandCropModal({
   const [crop, setCrop] = useState({ x: 0, y: 0 });
   const [zoom, setZoom] = useState(1);
   const [pixelCrop, setPixelCrop] = useState<Area | null>(null);
-  const [aspect, setAspect] = useState<number>(SLOT_ASPECT[slot] || 1);
   const [busy, setBusy] = useState(false);
   const [error, setError] = useState("");
   const [dragOver, setDragOver] = useState(false);
   const fileInputRef = useRef<HTMLInputElement>(null);
+  // 已识别过比例的图片（每张图进入裁剪时只自动推荐一次画幅）
+  const detectedSrcRef = useRef<string | null>(null);
+
+  // Favicon 固定方形，不参与画幅/铺法；auto=原图比例自由裁剪
+  const isFavicon = slot === "favicon";
+  const effectiveSize: BrandLogoSize = isFavicon ? "sq" : logoSize;
+  const isAuto = effectiveSize === "auto";
+  const cropAspect: number | undefined = isFavicon ? 1 : BRAND_LOGO_SIZE_ASPECT[effectiveSize];
 
   // 打开时拉取媒体库
   useEffect(() => {
@@ -71,6 +83,23 @@ export default function BrandCropModal({
       .catch(() => setMedia([]));
   }, [open]);
 
+  // 图片进入裁剪后，按原始比例自动推荐画幅（差距大→原图自适应），每张图仅一次
+  useEffect(() => {
+    if (!imageSrc || isFavicon || detectedSrcRef.current === imageSrc) return;
+    detectedSrcRef.current = imageSrc;
+    const img = new Image();
+    img.onload = () => {
+      onSizeChange?.(suggestLogoSize(img.naturalWidth, img.naturalHeight));
+    };
+    img.src = imageSrc;
+  }, [imageSrc, isFavicon, onSizeChange]);
+
+  // 画幅变化时重置构图位置（换画幅=重新构图；缩放保留）
+  useEffect(() => {
+    if (!open) return;
+    setCrop({ x: 0, y: 0 });
+  }, [effectiveSize, open]);
+
   // 关闭时复位并释放本地 blob URL
   useEffect(() => {
     if (!open) {
@@ -82,10 +111,10 @@ export default function BrandCropModal({
       setCrop({ x: 0, y: 0 });
       setZoom(1);
       setPixelCrop(null);
-      setAspect(SLOT_ASPECT[slot] || 1);
       setError("");
       setBusy(false);
       setDragOver(false);
+      detectedSrcRef.current = null;
     }
   }, [open, slot]);
 
@@ -178,12 +207,15 @@ export default function BrandCropModal({
   };
 
   const confirmUpload = async () => {
-    if (!imageSrc || !pixelCrop || busy) return;
+    if (!imageSrc || busy) return;
+    if (!isAuto && !pixelCrop) return;
     setBusy(true);
     setError("");
     try {
-      // 浏览器端裁剪并以 WebP 导出（质量自适应，直到 ≤ 2MB）
-      const blob = await getCroppedBrandWebp(imageSrc, pixelCrop, aspect);
+      // 原图模式：整图直传不裁剪；固定画幅：按裁剪区域导出
+      const blob = isAuto
+        ? await getFullBrandWebp(imageSrc)
+        : await getCroppedBrandWebp(imageSrc, pixelCrop!, cropAspect!);
       const file = new File([blob], "brand.webp", { type: "image/webp" });
       const url = await apiUploadBrand(slot, file);
       onCropped(url);
@@ -292,64 +324,166 @@ export default function BrandCropModal({
         </>
       ) : (
         <>
-          {/* 比例选择 */}
-          <div className="flex items-center gap-2 mb-3 flex-wrap">
-            <span className="text-[12px]" style={{ color: "var(--ink-3)" }}>比例</span>
-            {ASPECT_OPTIONS.map((opt) => (
-              <button
-                key={opt.id}
-                type="button"
-                onClick={() => setAspect(opt.aspect)}
-                className={`px-2.5 py-1 rounded-md text-[12px] font-medium transition-colors ${
-                  aspect === opt.aspect
-                    ? "bg-[var(--accent)] text-white"
-                    : "bg-[var(--panel-2)] text-[var(--ink-2)] hover:bg-[var(--panel-3)]"
-                }`}
+          {/* 画幅：唯一的比例控件（同时决定裁剪比例与页眉图框）；favicon 固定方形不展示 */}
+          {!isFavicon && (
+            <div className="mb-3">
+              <div className="flex items-center gap-1.5 mb-1.5">
+                <span className="text-[12px] font-semibold" style={{ color: "var(--ink-3)" }}>画幅</span>
+                <span className="text-[11px]" style={{ color: "var(--ink-3)" }}>已按图片比例推荐，可手动调整</span>
+              </div>
+              <div className="admin-brand-size-row" role="group" aria-label="显示画幅">
+                {BRAND_LOGO_SIZES.map((item) => {
+                  const on = effectiveSize === item.id;
+                  return (
+                    <button
+                      key={item.id}
+                      type="button"
+                      className={`admin-brand-size-chip${on ? " is-on" : ""}`}
+                      onClick={() => onSizeChange?.(item.id)}
+                    >
+                      <span className="admin-brand-size-chip-label">{item.label}</span>
+                      <span className="admin-brand-size-chip-px">
+                        {item.w ? `${item.w}×${item.h}` : "自适应"}
+                      </span>
+                    </button>
+                  );
+                })}
+              </div>
+            </div>
+          )}
+
+          {/* 原图模式：整图直传，不裁剪；固定画幅：裁剪 */}
+          {isAuto ? (
+            <div
+              className="relative w-full h-72 rounded-xl overflow-hidden flex items-center justify-center p-4"
+              style={{ background: cropBg }}
+            >
+              {/* eslint-disable-next-line @next/next/no-img-element */}
+              <img
+                src={imageSrc || ""}
+                alt="整图预览"
+                className="max-w-full max-h-full object-contain"
+                style={{ borderRadius: 6 }}
+              />
+              <span
+                className="absolute left-2.5 top-2.5 text-[11px] px-1.5 py-0.5 rounded"
+                style={{
+                  background: "rgba(0,0,0,.45)",
+                  color: "#fff",
+                }}
               >
-                {opt.label}
-              </button>
-            ))}
-          </div>
+                整图使用，不裁剪
+              </span>
+            </div>
+          ) : (
+            <>
+              <div
+                className="relative w-full h-72 rounded-xl overflow-hidden"
+                style={{ background: cropBg }}
+              >
+                <Cropper
+                  image={imageSrc}
+                  crop={crop}
+                  zoom={zoom}
+                  aspect={cropAspect}
+                  cropShape="rect"
+                  showGrid={true}
+                  onCropChange={setCrop}
+                  onZoomChange={setZoom}
+                  onCropComplete={onCropComplete}
+                />
+              </div>
 
-          {/* 裁剪区 */}
+              {/* 缩放 + 重置 */}
+              <div className="flex items-center gap-3 mt-4">
+                <span style={{ color: "var(--ink-3)" }}><ZoomIn size={15} /></span>
+                <input
+                  type="range"
+                  min={1}
+                  max={3}
+                  step={0.01}
+                  value={zoom}
+                  onChange={(e) => setZoom(Number(e.target.value))}
+                  className="flex-1 h-1.5 rounded-full appearance-none cursor-pointer"
+                  style={{ accentColor: "var(--accent)", background: "var(--panel-3)" }}
+                  aria-label="缩放"
+                />
+                <span style={{ color: "var(--ink-3)" }}><ZoomIn size={19} /></span>
+                <button
+                  type="button"
+                  onClick={() => {
+                    setZoom(1);
+                    setCrop({ x: 0, y: 0 });
+                  }}
+                  className="btn btn-line btn-sm shrink-0"
+                  title="重置缩放与位置"
+                >
+                  <RotateCcw size={13} /> 重置
+                </button>
+              </div>
+            </>
+          )}
+
+          {/* 铺法：仅固定画幅需要；原图模式图框随图，无需铺法 */}
+          {!isFavicon && (
+            isAuto ? (
+              <p className="text-[11.5px] mt-3" style={{ color: "var(--ink-3)" }}>
+                原图模式：整图使用不裁剪，页眉图框按图片原始比例自动给宽，图片完整不变形。
+              </p>
+            ) : (
+              <div className="mt-3">
+                <div className="flex items-center justify-between gap-3">
+                  <span className="text-[12px] font-semibold shrink-0" style={{ color: "var(--ink-3)" }}>铺法</span>
+                  <AdminSegmented
+                    role="group"
+                    size="sm"
+                    ariaLabel="适配方式"
+                    value={logoFit}
+                    onChange={(v) => onFitChange?.(v)}
+                    options={BRAND_LOGO_FITS.map((item) => ({ key: item.id, label: item.label }))}
+                  />
+                </div>
+                <p className="text-[11.5px] mt-1.5" style={{ color: "var(--ink-3)" }}>
+                  {logoFit === "contain"
+                    ? "适应：完整显示图片，比例不匹配时留空（推荐）"
+                    : logoFit === "cover"
+                      ? "填充：裁切填满画幅"
+                      : logoFit === "repeat"
+                        ? "平铺：重复铺满画幅"
+                        : "拉伸：变形填满画幅"}
+                </p>
+              </div>
+            )
+          )}
+
+          {/* 页眉实时预览：深色 Logo 用深色衬底并局部反转文字变量 */}
           <div
-            className="relative w-full h-72 rounded-xl overflow-hidden"
-            style={{ background: cropBg }}
+            className="mt-3 rounded-xl px-3.5 py-2.5 flex items-center min-h-[56px]"
+            style={{
+              background: cropBg,
+              ...(slot === "logo_dark"
+                ? ({ "--ink": "#f5f6f8", "--ink-3": "rgba(255,255,255,.55)" } as CSSProperties)
+                : null),
+            }}
+            aria-label="页眉预览"
           >
-            <Cropper
-              image={imageSrc}
-              crop={crop}
-              zoom={zoom}
-              aspect={aspect}
-              cropShape="rect"
-              showGrid={true}
-              onCropChange={setCrop}
-              onZoomChange={setZoom}
-              onCropComplete={onCropComplete}
+            <BrandLockup
+              mode="image_text"
+              size={effectiveSize}
+              fit={logoFit}
+              name="站点名称"
+              wordmark=""
+              logoLight={imageSrc || ""}
+              logoDark=""
             />
           </div>
 
-          {/* 缩放 */}
-          <div className="flex items-center gap-3 mt-4">
-            <span style={{ color: "var(--ink-3)" }}><ZoomIn size={15} /></span>
-            <input
-              type="range"
-              min={1}
-              max={3}
-              step={0.01}
-              value={zoom}
-              onChange={(e) => setZoom(Number(e.target.value))}
-              className="flex-1 h-1.5 rounded-full appearance-none cursor-pointer"
-              style={{ accentColor: "var(--accent)", background: "var(--panel-3)" }}
-              aria-label="缩放"
-            />
-            <span style={{ color: "var(--ink-3)" }}><ZoomIn size={19} /></span>
-          </div>
-
           {/* 输出说明 + 操作 */}
           <div className="flex items-center justify-between mt-5">
             <span className="text-[12px]" style={{ color: "var(--ink-3)" }}>
-              输出 WebP，高度 ≤ 2048px
+              {isAuto
+                ? "输出 WebP · 高度 40px，宽度随原图比例"
+                : `输出 WebP · 图框 ${brandLogoBox(effectiveSize).w}×${brandLogoBox(effectiveSize).h}px`}
             </span>
             <div className="flex items-center gap-2">
               <button type="button" onClick={backToLibrary} disabled={busy} className="btn btn-line btn-sm">