Fix re-grab lifecycle: resolve on import, blocklist bad release, sync cards

[vancityactivist]

Summary

Fixes the issue-handling / re-grab workflow gaps where a Re-grab click could "resolve" an issue that wasn't actually fixed, re-download the same bad release, or queue duplicate downloads.

• Resolve on import, not grab — a grab now records an in-flight re-grab (regrab_state) and the issue stays open. The notification poller watches the arr queue: on import it resolves the issue in Seerr and DMs the reporter; if the download leaves the queue without importing it flags the failure and re-broadcasts actionable cards to the handlers.
• Blocklist the bad release — the release that produced the reported file is excluded from the re-search and marked failed (blocklisted) after the replacement grab, so the identical release can't be re-grabbed. Blocklisting is ordered after the grab so the arr's own redownload-on-failure search sees the queued replacement instead of double-grabbing.
• Skip season packs for single-episode fixes — grabbing a whole season to fix one episode re-downloaded everything and left same-quality duplicates unimported.
• Double-fire guards + card sync — every broadcast copy of an issue card (each handler DM + the channel post) is tracked in a new issue_messages table; outcomes are synced onto all copies and stale buttons are stripped. Re-grab/Resolve refuse when the issue is already resolved or a re-grab is in flight (with a 6h staleness escape hatch for stuck downloads). The dashboard's re-grab/resolve actions use the same lifecycle.
• New admin setting — Settings → General → Bot behaviour: "Allow users to request 'All seasons' of a show". When off, the TV season picker drops the All-seasons option and users must pick individual seasons (for servers with strict season quotas). Persisted across restarts.

New tracked_issues columns and the issue_messages table are applied via the existing idempotent migration path — no manual DB steps.

Test plan

• 190 tests pass (19 new): release exclusion + blocklist ordering, season-pack filtering, grab-without-resolve, import/failure poller paths, double-fire guards, card-copy tracking + sync, store migrations, settings toggle, season picker without "All seasons"

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