fix(db): bump sqlx to 0.9, honour no-transaction

sqlx-sqlite 0.8 ignored Migration.no_tx and wrapped every
migration in a transaction, where PRAGMA foreign_keys = OFF
is a no-op — so any table rebuild cascade-deleted children.
0.9 honours `-- no-transaction`, so 0014 drops its
movie_releases_backup / episode_releases_backup workaround
and runs the plain rebuild recipe with foreign keys off.
A migration test rebuilds both parents from a pre-0014
database and asserts the child link rows survive.

Closes #155

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.sqlx/query-bb612df5646dba7ce195aa0a00068df7fa42de0b4322c78cc4cf43a695d16e54.json

@@ -6,7 +6,8 @@
       {
         "name": "exists!: bool",
         "ordinal": 0,
-        "type_info": "Integer"
+        "type_info": "Integer",
+        "origin": "Expression"
       }
     ],
     "parameters": {