refactor: upgrade to Go 1.26 and modernize code idioms

- Replace `interface{}` with `any` type alias across all packages
- Use built-in `min()`/`max()` for parameter clamping
- Use `slices.SortFunc`, `slices.Min`, `slices.Max` for cleaner code
- Use `strings.Cut()` for simpler string parsing in auth middleware
- Use `errors.Is()` for proper error comparison in handlers
- Update dependencies: golang.org/x/image 0.37.0 -> 0.38.0
- Add Wire code generation guidelines to ARCHITECTURE.md
- Disable Go cache in CI build workflow

internal/service/call_service.go

@@ -35,7 +35,7 @@ type ActiveCall struct {
 	MediaType      string // voice 或 video
 	CreatedAt      time.Time
 	StartedAt      *time.Time
-	Duration       int64  // 通话时长（秒）
+	Duration       int64 // 通话时长（秒）
 	// 参与者状态
 	Participants map[string]*ActiveParticipant
 	// ICE Servers
@@ -228,7 +228,7 @@ func (s *callService) Invite(ctx context.Context, callerID, calleeID, conversati
 	calleeOnline := s.hub.HasClients(calleeID)
 
 	// 发送来电通知
-	payload := map[string]interface{}{
+	payload := map[string]any{
 		"call_id":         call.ID,
 		"conversation_id": conversationID,
 		"caller_id":       callerID,
@@ -286,14 +286,14 @@ func (s *callService) Accept(ctx context.Context, callID, userID string) (*Activ
 	s.mu.Unlock()
 
 	// 通知拨打方
-	s.hub.PublishToUserOnline(call.CallerID, "call_accepted", map[string]interface{}{
+	s.hub.PublishToUserOnline(call.CallerID, "call_accepted", map[string]any{
 		"call_id":     callID,
 		"started_at":  now.UnixMilli(),
 		"ice_servers": s.config.WebRTC.ICEServers,
 	})
 
 	// 通知被叫方其他设备
-	s.hub.PublishToUserOnline(userID, "call_answered_elsewhere", map[string]interface{}{
+	s.hub.PublishToUserOnline(userID, "call_answered_elsewhere", map[string]any{
 		"call_id": callID,
 		"reason":  "answered_on_another_device",
 	})
@@ -328,7 +328,7 @@ func (s *callService) Reject(ctx context.Context, callID, userID string) error {
 	s.saveCallHistory(call, model.CallStatusRejected, 0)
 
 	// 通知拨打方
-	s.hub.PublishToUserOnline(call.CallerID, "call_rejected", map[string]interface{}{
+	s.hub.PublishToUserOnline(call.CallerID, "call_rejected", map[string]any{
 		"call_id": callID,
 		"reason":  "rejected",
 	})
@@ -362,7 +362,7 @@ func (s *callService) Busy(ctx context.Context, callID, userID string) error {
 	s.saveCallHistory(call, model.CallStatusMissed, 0)
 
 	// 通知拨打方
-	s.hub.PublishToUserOnline(call.CallerID, "call_busy", map[string]interface{}{
+	s.hub.PublishToUserOnline(call.CallerID, "call_busy", map[string]any{
 		"call_id": callID,
 	})
 
@@ -420,7 +420,7 @@ func (s *callService) End(ctx context.Context, callID, userID string, reason str
 	// 通知其他参与者
 	for pUserID := range call.Participants {
 		if pUserID != userID {
-			s.hub.PublishToUserOnline(pUserID, "call_ended", map[string]interface{}{
+			s.hub.PublishToUserOnline(pUserID, "call_ended", map[string]any{
 				"call_id":  callID,
 				"ended_by": userID,
 				"reason":   reason,
@@ -452,7 +452,7 @@ func (s *callService) RelaySignal(ctx context.Context, callID, fromUserID string
 
 	for pUserID := range call.Participants {
 		if pUserID != fromUserID {
-			s.hub.PublishToUserOnlineReliable(pUserID, signalType, map[string]interface{}{
+			s.hub.PublishToUserOnlineReliable(pUserID, signalType, map[string]any{
 				"call_id": callID,
 				"from_id": fromUserID,
 				"payload": json.RawMessage(payload),
@@ -481,7 +481,7 @@ func (s *callService) SetMuted(ctx context.Context, callID, userID string, muted
 
 	for pUserID := range call.Participants {
 		if pUserID != userID {
-			s.hub.PublishToUserOnline(pUserID, "call_peer_muted", map[string]interface{}{
+			s.hub.PublishToUserOnline(pUserID, "call_peer_muted", map[string]any{
 				"call_id": callID,
 				"user_id": userID,
 				"muted":   muted,