feat: Antigravity 端点签名迁移至 gemini:chat，流式 usage 提取重构与请求详情自动刷新

- Antigravity 端点签名从 gemini:cli 统一为 gemini:chat，保留向后兼容，含 DB 迁移
- 流式处理中 usage/completion/text 提取抽离为 _update_ctx_from_provider_event，
  支持 envelope 解包后提取，避免格式转换流程中重复计数
- 新增 has_format_conversion 属性，区分真正的格式转换与 envelope rewrite，
  修正 usage 展示层的格式转换标记
- 请求详情抽屉对未完成请求支持自动轮询刷新，关闭时自动停止
- 按次计费样式调整；实际成本仅在倍率非 1.0 时显示；缓存日志降级为 trace

src/api/admin/endpoints/keys.py

@@ -1009,7 +1009,7 @@ class AdminRefreshProviderQuotaAdapter(AdminApiAdapter):
 
         # 获取端点：
         # - Codex: openai:cli
-        # - Antigravity: gemini:cli（用于触发 oauth 刷新 + 提供 auth_config.project_id）
+        # - Antigravity: gemini:chat（用于触发 oauth 刷新 + 提供 auth_config.project_id）
         endpoint = None
         if provider_type == ProviderType.CODEX:
             for ep in provider.endpoints:
@@ -1019,12 +1019,16 @@ class AdminRefreshProviderQuotaAdapter(AdminApiAdapter):
             if not endpoint:
                 raise InvalidRequestException("找不到有效的 openai:cli 端点")
         else:
-            for ep in provider.endpoints:
-                if ep.api_format == "gemini:cli" and ep.is_active:
-                    endpoint = ep
+            # Prefer the new signature, but keep backward-compat with existing DB rows.
+            for sig in ("gemini:chat", "gemini:cli"):
+                for ep in provider.endpoints:
+                    if ep.api_format == sig and ep.is_active:
+                        endpoint = ep
+                        break
+                if endpoint is not None:
                     break
             if not endpoint:
-                raise InvalidRequestException("找不到有效的 gemini:cli 端点")
+                raise InvalidRequestException("找不到有效的 gemini:chat/gemini:cli 端点")
 
         results: list[dict] = []
         success_count = 0

src/api/admin/provider_query.py

@@ -70,7 +70,7 @@ async def _resolve_key_auth(
     auth_config: dict[str, Any] | None = None
 
     if auth_type == "oauth":
-        endpoint_api_format = "gemini:cli" if provider_type == ProviderType.ANTIGRAVITY else None
+        endpoint_api_format = "gemini:chat" if provider_type == ProviderType.ANTIGRAVITY else None
         try:
             resolved = await resolve_oauth_access_token(
                 key_id=str(api_key.id),

src/api/admin/usage/routes.py

@@ -1181,6 +1181,7 @@ class AdminUsageDetailAdapter(AdminApiAdapter):
             "is_stream": usage_record.is_stream,
             "status_code": usage_record.status_code,
             "error_message": usage_record.error_message,
+            "status": usage_record.status,
             "response_time_ms": usage_record.response_time_ms,
             "first_byte_time_ms": usage_record.first_byte_time_ms,  # 首字时间 (TTFB)
             "created_at": usage_record.created_at.isoformat() if usage_record.created_at else None,