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-e5b075d0b7fe5410d3e55d5daf7837d0a9398b1954e713e80a1d82c0a7e172a6.json

@@ -0,0 +1,26 @@
+{
+  "db_name": "SQLite",
+  "query": "SELECT id AS \"id!: i64\" FROM subtitle_files WHERE path = ?",
+  "describe": {
+    "columns": [
+      {
+        "name": "id!: i64",
+        "ordinal": 0,
+        "type_info": "Integer",
+        "origin": {
+          "Table": {
+            "table": "subtitle_files",
+            "name": "id"
+          }
+        }
+      }
+    ],
+    "parameters": {
+      "Right": 1
+    },
+    "nullable": [
+      false
+    ]
+  },
+  "hash": "e5b075d0b7fe5410d3e55d5daf7837d0a9398b1954e713e80a1d82c0a7e172a6"
+}