feat: add INVALID_MODEL_ID retry config + detailed request logging

- Config: new InvalidModelRetries field (default 3, range 0-20)
- Admin API: /admin/api/general GET/POST for general settings
- Admin UI: new "通用设置" card with retry count input
- CallKiroAPI: same-endpoint retry on HTTP 400 INVALID_MODEL_ID
  before falling back to next endpoint
- CallKiroAPI: switched to log.Printf with timestamp, account,
  model, attempt counter, elapsed time, error body truncation

proxy/handler.go

@@ -1781,6 +1781,10 @@ func (h *Handler) handleAdminAPI(w http.ResponseWriter, r *http.Request) {
 		h.apiGetEndpointConfig(w, r)
 	case path == "/endpoint" && r.Method == "POST":
 		h.apiUpdateEndpointConfig(w, r)
+	case path == "/general" && r.Method == "GET":
+		h.apiGetGeneralConfig(w, r)
+	case path == "/general" && r.Method == "POST":
+		h.apiUpdateGeneralConfig(w, r)
 	case path == "/version" && r.Method == "GET":
 		h.apiGetVersion(w, r)
 	case path == "/export" && r.Method == "POST":
@@ -2745,6 +2749,41 @@ func (h *Handler) apiUpdateEndpointConfig(w http.ResponseWriter, r *http.Request
 	json.NewEncoder(w).Encode(map[string]bool{"success": true})
 }
 
+// apiGetGeneralConfig 获取通用设置
+func (h *Handler) apiGetGeneralConfig(w http.ResponseWriter, r *http.Request) {
+	json.NewEncoder(w).Encode(map[string]interface{}{
+		"invalidModelRetries": config.GetInvalidModelRetries(),
+	})
+}
+
+// apiUpdateGeneralConfig 更新通用设置
+func (h *Handler) apiUpdateGeneralConfig(w http.ResponseWriter, r *http.Request) {
+	var req struct {
+		InvalidModelRetries *int `json:"invalidModelRetries"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		w.WriteHeader(400)
+		json.NewEncoder(w).Encode(map[string]string{"error": "Invalid JSON"})
+		return
+	}
+
+	if req.InvalidModelRetries != nil {
+		n := *req.InvalidModelRetries
+		if n < 0 || n > 20 {
+			w.WriteHeader(400)
+			json.NewEncoder(w).Encode(map[string]string{"error": "invalidModelRetries must be 0-20"})
+			return
+		}
+		if err := config.UpdateInvalidModelRetries(n); err != nil {
+			w.WriteHeader(500)
+			json.NewEncoder(w).Encode(map[string]string{"error": err.Error()})
+			return
+		}
+	}
+
+	json.NewEncoder(w).Encode(map[string]bool{"success": true})
+}
+
 // apiGetVersion 获取版本信息
 func (h *Handler) apiGetVersion(w http.ResponseWriter, r *http.Request) {
 	json.NewEncoder(w).Encode(map[string]string{