refactor: Gitea 式目录改组，移除本分支 SPA 与杂项产物

将 model/service/handler/middleware 迁至 models/services/routers/api/modules/auth，并删除 frontend、embed_static、scripts 及误入库缓存/二进制。

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

services/friend_link_reciprocal_async.go

@@ -0,0 +1,62 @@
+package service
+
+import (
+	"sync"
+	"time"
+
+	"git.iioio.com/freefire/jiang13-forum/model"
+)
+
+const reciprocalCheckConcurrency = 3
+
+var (
+	reciprocalCheckMu  sync.Mutex
+	reciprocalCheckGen = map[uint]uint64{}
+	reciprocalCheckSem = make(chan struct{}, reciprocalCheckConcurrency)
+)
+
+func init() {
+	for i := 0; i < reciprocalCheckConcurrency; i++ {
+		reciprocalCheckSem <- struct{}{}
+	}
+}
+
+// EnqueueReciprocalCheck 异步检测回链；同一申请多次入队时仅保留最后一次结果
+func EnqueueReciprocalCheck(applyID uint, pageURL, ourSiteURL string) {
+	reciprocalCheckMu.Lock()
+	reciprocalCheckGen[applyID]++
+	gen := reciprocalCheckGen[applyID]
+	reciprocalCheckMu.Unlock()
+
+	go runReciprocalCheck(applyID, gen, pageURL, ourSiteURL)
+}
+
+func runReciprocalCheck(applyID uint, gen uint64, pageURL, ourSiteURL string) {
+	reciprocalCheckSem <- struct{}{}
+	defer func() { <-reciprocalCheckSem }()
+
+	verified, note := VerifyReciprocalLink(pageURL, ourSiteURL)
+	now := time.Now()
+
+	reciprocalCheckMu.Lock()
+	if reciprocalCheckGen[applyID] != gen {
+		reciprocalCheckMu.Unlock()
+		return
+	}
+	reciprocalCheckMu.Unlock()
+
+	_ = model.DB.Model(&model.FriendLinkApply{}).Where("id = ?", applyID).Updates(map[string]interface{}{
+		"reciprocal_verified":   verified,
+		"reciprocal_check_note": note,
+		"reciprocal_checked_at": now,
+	}).Error
+}
+
+// ResetReciprocalCheckState 重置为检测中，供重新检测使用
+func ResetReciprocalCheckState(applyID uint) {
+	_ = model.DB.Model(&model.FriendLinkApply{}).Where("id = ?", applyID).Updates(map[string]interface{}{
+		"reciprocal_verified":   false,
+		"reciprocal_check_note": "",
+		"reciprocal_checked_at": nil,
+	}).Error
+}