feat: 类型帖互动、积分经济与发帖体验

补齐问答采纳/重开、投票匿名与有票禁编、悬赏过期退回、抽奖回帖开奖，并接入积分账本与发帖附件可见性。

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/app/chat/ChatShell.tsx

@@ -331,7 +331,7 @@ export default function ChatShell({
             className="w-8 h-8 flex items-center justify-center rounded-full hover:bg-[var(--accent-soft)] transition-colors"
             style={{ color: "var(--accent)" }}
             aria-label="新建群聊"
-            title="新建群聊"
+            data-tip="新建群聊"
           >
             <Plus size={18} />
           </button>
@@ -480,7 +480,7 @@ export default function ChatShell({
                                 background: "var(--accent-soft)",
                                 color: "var(--accent)",
                               }}
-                              title={room.is_default ? "强制置顶" : "置顶"}
+                              data-tip={room.is_default ? "强制置顶" : "置顶"}
                             >
                               <Pin size={10} /> 置顶
                             </span>

frontend/app/chat/[id]/ChatRoomClient.tsx

@@ -132,7 +132,7 @@ function RecallNotice({
         href={`/u/${uid}`}
         className="font-semibold transition-opacity hover:opacity-80"
         style={nameStyle}
-        title={`查看 ${name} 的主页`}
+        data-tip={`查看 ${name} 的主页`}
       >
         {name}
       </Link>
@@ -217,7 +217,7 @@ function highlightMentions(content: string, members: ChatRoomMember[]) {
           key={`m-${i}`}
           href={`/u/${user.id}`}
           className="j13-mention-token"
-          title={`查看 ${user.nickname || user.username} 的主页`}
+          data-tip={`查看 ${user.nickname || user.username} 的主页`}
           onClick={(e) => e.stopPropagation()}
           onContextMenu={(e) => e.stopPropagation()}
         >
@@ -1001,7 +1001,7 @@ export default function ChatRoomClient({
                   color: rightPanel === "members" ? "var(--accent)" : "var(--ink-2)",
                   background: rightPanel === "members" ? "var(--accent-soft)" : undefined,
                 }}
-                title="成员"
+                data-tip="成员"
               >
                 <Users size={16} />
               </button>
@@ -1015,7 +1015,7 @@ export default function ChatRoomClient({
                   color: rightPanel === "invite" ? "var(--accent)" : "var(--ink-2)",
                   background: rightPanel === "invite" ? "var(--accent-soft)" : undefined,
                 }}
-                title="邀请成员"
+                data-tip="邀请成员"
               >
                 <UserPlus size={16} />
               </button>
@@ -1029,7 +1029,7 @@ export default function ChatRoomClient({
                   color: rightPanel === "settings" ? "var(--accent)" : "var(--ink-2)",
                   background: rightPanel === "settings" ? "var(--accent-soft)" : undefined,
                 }}
-                title="群设置"
+                data-tip="群设置"
               >
                 <Settings size={16} />
               </button>
@@ -1040,7 +1040,7 @@ export default function ChatRoomClient({
                 aria-label={isDirect ? "关闭私聊" : "退出群聊"}
                 className="w-9 h-9 flex items-center justify-center rounded-full transition-colors hover:bg-[var(--danger-soft)]"
                 style={{ color: "var(--ink-3)" }}
-                title={isDirect ? "关闭私聊" : "退出群聊"}
+                data-tip={isDirect ? "关闭私聊" : "退出群聊"}
               >
                 <LogOut size={16} />
               </button>