feat(fam-edge): 云端模型调用统计 - 新增 model_calls 表(provider/model/时间/耗时/成功/失败原因)，gemini/nvidia 每次请求经 model_call_hook 记录并随 sync delta 下发；gemini 支持模型级 model_timeouts（lite 实测22.6s×4≈90s）

fam-edge/src/fam_edge/model_adapters/base_adapter.py

@@ -33,6 +33,21 @@ class BaseModelAdapter(ABC):
         self.config = config
         # 角色: vision=视觉分析, text=智能问答兜底(本地模型); 默认 vision
         self.role = config.get('role', 'vision')
+        # 模型调用统计回调（由编排层注入）:
+        # hook(provider, model, started_at, duration_sec, success, error)
+        self.model_call_hook = None
+
+    def _emit_model_call(self, model: str, started_at: str,
+                         duration_sec: float, success: bool,
+                         error: str = ''):
+        """上报一次模型调用统计（供前端展示成功/失败/耗时/失败原因）"""
+        hook = self.model_call_hook
+        if hook is None:
+            return
+        try:
+            hook(self.provider_name, model, started_at, duration_sec, success, error)
+        except Exception:
+            pass  # 统计失败不影响主流程
 
     def get_role(self) -> str:
         """返回适配器角色: 'vision' 或 'text'"""