Play episodes whose enclosure is still cleartext http

Reported from the phone: Show 62 of Hardcore History failed with
ERROR_CODE_IO_CLEARTEXT_NOT_PERMITTED. Android has refused cleartext
since API 28 and this app declares no exemption, so any enclosure
published over http fails the moment it is streamed rather than played
from a downloaded file. Dan Carlin's older episodes are published that
way while the recent ones are not, which is why it went unnoticed; the
manifest has not changed since long before the skip server, so this is
not a regression from that work.

Upgrading the scheme rather than permitting cleartext: that exact URL
answers 200 over TLS and a range request returns 206 audio/mpeg, podcast
CDNs serve the same path either way, and an exemption would weaken every
other request the app makes for the sake of a few old enclosures. A host
with genuinely no TLS is no worse off, since cleartext was refused
already.

Two paths, because they do not share a stack. Everything that goes
through OkHttp -- downloads, feeds, chapters, artwork -- is covered by an
interceptor on the one client the graph builds, which is the right home
for a property of the app's networking rather than of any one feature.
ExoPlayer has its own data source, so playback converts the URI as it
builds the media item.

Putting the conversion at the downloader's call site instead broke four
of its MockWebServer tests, which was the tests making a fair point: a
global network policy does not belong at one call site. Components under
test build their own client and are untouched by the interceptor.

Also stops the server starving on-demand episode requests. The poll loop
and the request queue share a goroutine, so an episode the phone asked
for waited out the whole cycle -- hours across 42 shows, which is why the
tap that produced this report registered the episode and never fetched
it. Now drained before each feed, bounding the wait at one feed.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018AwnALZL6bD4VBtATDVv3B

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