feat(arr): add subtitle queries

Recording a subtitle is idempotent on both keys the schema carries: the
sidecar path, and the language an embedded track satisfies, so a second
probe or a re-import converges instead of duplicating. Attempts are
upserted per (media file, language); the work list is every language that
is not satisfied, newest import first, which is the order §15 wants the
daily allowance spent in.

.sqlx/query-c5a9e43cfeb315e70bbb603f22acc519d7df3cd0b4d606d0d9056414ac6c503b.json

@@ -0,0 +1,12 @@
+{
+  "db_name": "SQLite",
+  "query": "INSERT INTO subtitle_attempts (media_file_id, language, state)\n         VALUES (?, ?, 'satisfied')\n         ON CONFLICT (media_file_id, language) DO UPDATE\n         SET state        = 'satisfied',\n             last_failure = NULL,\n             updated_at   = strftime('%Y-%m-%dT%H:%M:%fZ', 'now')",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Right": 2
+    },
+    "nullable": []
+  },
+  "hash": "c5a9e43cfeb315e70bbb603f22acc519d7df3cd0b4d606d0d9056414ac6c503b"
+}