fix: FCM must not break ingest; add requests dependency (0.9.3)

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

backend/app/services/mobile_notify.py

@@ -69,7 +69,12 @@ def _fcm_access_token(service_account_path: str) -> str:
         from google.oauth2 import service_account
         from google.auth.transport.requests import Request
     except ImportError as exc:
-        raise MobileNotConfiguredError("google-auth package is required for FCM") from exc
+        msg = str(exc).lower()
+        if "requests" in msg:
+            raise MobileNotConfiguredError(
+                "FCM: установите пакет requests (pip install requests)"
+            ) from exc
+        raise MobileNotConfiguredError("FCM: установите google-auth") from exc
 
     creds = service_account.Credentials.from_service_account_file(
         service_account_path,
@@ -116,7 +121,19 @@ def _send_fcm_data(
             raise MobileNotConfiguredError("FCM не настроен на сервере")
         return
 
-    access_token = _fcm_access_token(cfg.service_account_path)
+    try:
+        access_token = _fcm_access_token(cfg.service_account_path)
+    except (MobileNotConfiguredError, MobileSendError) as exc:
+        logger.warning("FCM skipped: %s", exc)
+        if require_success:
+            raise
+        return
+    except Exception:
+        logger.exception("FCM token acquisition failed")
+        if require_success:
+            raise MobileSendError("Failed to obtain FCM access token", status_code=502)
+        return
+
     url = f"https://fcm.googleapis.com/v1/projects/{cfg.project_id}/messages:send"
     headers = {
         "Authorization": f"Bearer {access_token}",