The YouTubeClient issued httpx requests directly, so a network/transport
failure (egress proxy unreachable, DNS, timeout, connection reset) escaped
as a raw httpx.ConnectError. Callers only guard against YouTubeError, so such
a fault propagated uncaught and surfaced as a 500 — e.g. opening an
un-enriched channel's page (GET /api/channels/{id} lazily enriches About
data) popped a blocking "Server error (500)" modal whenever the fixed-IP
egress proxy was down.
Route all client HTTP through a _send() helper that wraps httpx.HTTPError in
YouTubeError, so every existing 'except YouTubeError' degrades gracefully:
channel detail returns un-enriched (200), explore returns 422 (quiet), and
scheduler jobs log-and-continue instead of crashing.
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