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-3fc7d7e39520dc60fa81da21a4cae0c4a718e95f9718629f0aba9f3d00d179e1.json

@@ -6,12 +6,19 @@
       {
         "name": "air_date",
         "ordinal": 0,
-        "type_info": "Text"
+        "type_info": "Text",
+        "origin": {
+          "Table": {
+            "table": "episodes",
+            "name": "air_date"
+          }
+        }
       },
       {
         "name": "on_disk!: bool",
         "ordinal": 1,
-        "type_info": "Null"
+        "type_info": "Integer",
+        "origin": "Expression"
       }
     ],
     "parameters": {
@@ -19,7 +26,7 @@
     },
     "nullable": [
       true,
-      null
+      false
     ]
   },
   "hash": "3fc7d7e39520dc60fa81da21a4cae0c4a718e95f9718629f0aba9f3d00d179e1"