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-2afeefde38499d722f329d1d472bc89524ce6498ccd4098ba97979e0621b840b.json

@@ -0,0 +1,26 @@
+{
+  "db_name": "SQLite",
+  "query": "SELECT wanted_languages AS \"wanted_languages!: String\" FROM subtitle_settings WHERE id = 1",
+  "describe": {
+    "columns": [
+      {
+        "name": "wanted_languages!: String",
+        "ordinal": 0,
+        "type_info": "Text",
+        "origin": {
+          "Table": {
+            "table": "subtitle_settings",
+            "name": "wanted_languages"
+          }
+        }
+      }
+    ],
+    "parameters": {
+      "Right": 0
+    },
+    "nullable": [
+      false
+    ]
+  },
+  "hash": "2afeefde38499d722f329d1d472bc89524ce6498ccd4098ba97979e0621b840b"
+}