Fix coomer: offset pagination, per-query cache key, video-only posts

The API ignores page= (every page 2+ repeated page 1), searches shared a
single cache entry, image-only posts were listed as unplayable videos, and
gzip/br bodies were not decoded because wreq had no decompression features.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MUYdCh2nCVsQYgJAT7gwSi

docs/provider-fix-todo.md

@@ -23,7 +23,7 @@ Status: `[ ]` open, `[~]` in progress, `[x]` fixed and verified, `[-]` not repro
 |---|---|---|---|
 | [x] | `thaiporntv` | page URL "Unsupported URL", no `formats` | player attribute renamed `data-enc` -> `data-video-sources` (reversed base64 JSON `{quality,url}`); decoder handles both. 3 formats/item, yt-dlp OK, check.py passes |
 | [x] | `pornmz` | page URL "Unsupported URL", no `formats` | site changed `itemprop="contentURL"` -> `contentUrl`; selector now case-insensitive. Enrichment concurrency 10 + 25s per-item timeout. Origin is slow (15s+/detail) so first feed 25-50s. check.py passes |
-| [ ] | `coomer` | page URL "Unsupported URL"; media host CF-gated here | check whether `formats` are populated for videos |
+| [x] | `coomer` | page URL "Unsupported URL"; media host CF-gated here | image-only posts were listed as videos with no playable URL: now dropped, and a video in `attachments` is picked up. Also fixed: `page=` is ignored by the API (every page 2+ was a copy of page 1; now `o=` offset), search results shared one cache key, and compressed API bodies were not decoded (enabled wreq gzip/br/deflate/zstd). n*.coomer.st CDN connect-times-out from this host, and the API 429s this IP after bursts, so playback/"girl" search could not be verified end to end |
 | [ ] | `tube8` | page URL 404; `/proxy/tube8/{id}` 502 | |
 | [ ] | `hypnotube` | page URLs 404 on all sampled items | URL construction |
 | [ ] | `fullpornerorg` | `lulustream` proxy 403 / 502 | |