feat: 可选社区上报与官方精选展柜

默认关闭，仪表盘一键开关；枢纽由运维配置收报，人工精选后展示于 /showcase。

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

config/env.go

@@ -8,11 +8,12 @@ import (
 
 // 容器 / 编排常用环境变量（优先级：命令行 > 环境变量 > app.ini > 内置默认）
 const (
-	envWorkPath  = "JIANG13_WORK_PATH"
-	envConfig    = "JIANG13_CONFIG"
-	envHTTPPort  = "JIANG13_HTTP_PORT"
-	envData      = "JIANG13_DATA"
-	envJWTSecret = "JIANG13_JWT_SECRET"
+	envWorkPath     = "JIANG13_WORK_PATH"
+	envConfig       = "JIANG13_CONFIG"
+	envHTTPPort     = "JIANG13_HTTP_PORT"
+	envData         = "JIANG13_DATA"
+	envJWTSecret    = "JIANG13_JWT_SECRET"
+	envCommunityHub = "JIANG13_COMMUNITY_HUB"
 )
 
 func envOrDefault(key string) string {
@@ -30,3 +31,21 @@ func envIntOrZero(key string) int {
 	}
 	return n
 }
+
+// envBoolOrNil 解析布尔环境变量；未设置返回 nil
+func envBoolOrNil(key string) *bool {
+	v := strings.ToLower(envOrDefault(key))
+	if v == "" {
+		return nil
+	}
+	switch v {
+	case "1", "true", "yes", "on":
+		t := true
+		return &t
+	case "0", "false", "no", "off":
+		f := false
+		return &f
+	default:
+		return nil
+	}
+}