fix: split HTTP connect/read timeouts (Jellyfin build + qBit stats)

Every HTTP client passed an integer timeout to requests, applying the same
value to BOTH connect and read phases. A slow Jellyfin /Items page or qBit
/sync/maindata blew through the 10s read budget → ReadTimeoutError. Split
into a (connect=5s, read=60s default) tuple via shared http_timeout() helper.
The media index build worker uses a 180s read floor. Existing services with
low timeout_seconds benefit from bumping to 60+.

backend/src/media_library_viewer_api/integrations/authentik.py

@@ -33,7 +33,7 @@ def test_connection(
     try:
         base_url = str(config.get("base_url") or "").rstrip("/")
         api_token = str(secrets.get("api_token") or "")
-        timeout = float(config.get("timeout_seconds") or 10)
+        timeout = float(config.get("timeout_seconds") or 60)
         client = AuthentikClient(base_url=base_url, api_token=api_token, timeout=timeout)
         result = client.users(page=1, page_size=1)
         total = result.get("total", 0) if isinstance(result, dict) else 0
@@ -46,7 +46,7 @@ class AuthentikConfig(ServiceConfigBase):
     """Non-secret Authentik connection config."""
 
     base_url: ServiceBaseUrl
-    timeout_seconds: int = 10
+    timeout_seconds: int = 60
 
 
 DEFINITION = ServiceDefinition(