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+.
Add a shared ServiceBaseUrl type (BeforeValidator + Field description) in
integrations/base.py and apply it to base_url across all six service configs
(grafana, prometheus, alertmanager, jellyfin, jellyseerr, nextcloud). Missing
http:// or https:// schema now fails fast with a clear 422 instead of breaking
HTTP clients silently. Tests cover reject/accept cases; REQUIREMENTS updated.
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