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-b6974993af21da17e3f935cd0ab3cc4e14a9e7cf00e0decc15186ec39b74cf30.json

@@ -6,14 +6,20 @@
       {
         "name": "id!: i64",
         "ordinal": 0,
-        "type_info": "Integer"
+        "type_info": "Integer",
+        "origin": {
+          "Table": {
+            "table": "seasons",
+            "name": "id"
+          }
+        }
       }
     ],
     "parameters": {
       "Right": 2
     },
     "nullable": [
-      true
+      false
     ]
   },
   "hash": "b6974993af21da17e3f935cd0ab3cc4e14a9e7cf00e0decc15186ec39b74cf30"