feat(arr): serve subtitle status for title detail

Exposes per-media-file subtitles and missing wanted languages, with the
attempt reason, so #201's UI has one call per title (movies, episodes)
and one bulk call per series instead of one per episode.

.sqlx/query-2084928704dbb8a2c81692b9aa3b6edff64745945ea4e88d70bcb139e272c857.json

@@ -0,0 +1,21 @@
+{
+  "db_name": "SQLite",
+  "query": "SELECT EXISTS(SELECT 1 FROM series WHERE id = ?) AS \"exists!: bool\"",
+  "describe": {
+    "columns": [
+      {
+        "name": "exists!: bool",
+        "ordinal": 0,
+        "type_info": "Integer",
+        "origin": "Expression"
+      }
+    ],
+    "parameters": {
+      "Right": 1
+    },
+    "nullable": [
+      false
+    ]
+  },
+  "hash": "2084928704dbb8a2c81692b9aa3b6edff64745945ea4e88d70bcb139e272c857"
+}