fix(db): keep migration checksums stable

Issue #155 removed the sqlx 0.8 rebuild workarounds by editing migrations
0007, 0014 and 0021 in place. Editing an applied migration changes its
checksum, and `migrate()` refuses to run when one no longer matches what
`_sqlx_migrations` recorded, so the daemon exited on startup against any
database that had already applied them — production included.

The sqlx 0.9 bump is the fix and survives: a new migration can carry
`-- no-transaction` so `PRAGMA foreign_keys = OFF` holds and a table
rebuild stops cascade-deleting its children. Only the retroactive cleanup
of migrations that already ran is reverted, along with #153's
`CHECK (title <> '')`, which rode on the 0021 edit and needs a migration
of its own rather than a rewrite of history.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

crates/arr-db/migrations/0014_parked_state.sql

@@ -1,15 +1,11 @@
--- no-transaction
 -- #108: a vanished torrent must not re-grab. Overrides #86, which reopened
 -- the gap (state = 'missing', wanted untouched) so the next tick re-grabbed
 -- the same release. Adds 'parked' so the daemon can clear `wanted` and mark
 -- the title honestly instead — distinct from 'missing' (an open gap) and
 -- 'available' (satisfied). SQLite cannot alter a CHECK, so both tables are
 -- rebuilt (see 0007).
---
--- #155: runs outside a transaction so `PRAGMA foreign_keys = OFF` takes
--- effect and dropping the old tables does not cascade into their children.
 
-PRAGMA foreign_keys = OFF;
+CREATE TABLE movie_releases_backup AS SELECT * FROM movie_releases;
 
 CREATE TABLE movies_new (
     id                INTEGER PRIMARY KEY,
@@ -67,6 +63,11 @@ BEGIN
     SELECT RAISE(ABORT, 'movies require a movie root');
 END;
 
+INSERT INTO movie_releases SELECT * FROM movie_releases_backup;
+DROP TABLE movie_releases_backup;
+
+CREATE TABLE episode_releases_backup AS SELECT * FROM episode_releases;
+
 CREATE TABLE episodes_new (
     id               INTEGER PRIMARY KEY,
     season_id        INTEGER NOT NULL REFERENCES seasons (id) ON DELETE CASCADE,
@@ -101,4 +102,5 @@ CREATE INDEX episodes_pending_search
 
 CREATE INDEX episodes_state ON episodes (state);
 
-PRAGMA foreign_keys = ON;
+INSERT INTO episode_releases SELECT * FROM episode_releases_backup;
+DROP TABLE episode_releases_backup;