Remember unavailable movies and auto-grab them later (wishlist)

When Smart Search finds no good copy of a movie (unreleased / only CAMs), we
now record it instead of dropping it:
- New Wanted model + migration (dedup by tmdbId, status wanted|fulfilled).
- POST /__api/search/releases remembers a movie when it returns no options,
  and the UI confirms it was added to the wishlist.
- controller/wantedWatcher re-runs Smart Search for wishlisted items every 6h
  (and on boot); when a good copy appears it queues the recommended release,
  which then flows through the normal download + organize pipeline, and marks
  the item fulfilled.
- GET/DELETE /__api/search/wanted to view/remove the wishlist.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

models/sql/wanted.js

@@ -0,0 +1,32 @@
+'use strict';
+
+module.exports = (sequelize, DataTypes, Model) => {
+  class Wanted extends Model {
+    static associate(models) {
+    }
+  }
+  Wanted.init({
+    tmdbId: {
+      type: DataTypes.STRING,
+      primaryKey: true,
+      allowNull: false,
+    },
+    mediaType: {
+      type: DataTypes.STRING,
+      allowNull: false,
+      defaultValue: 'movie',
+    },
+    title: DataTypes.STRING,
+    year: DataTypes.STRING,
+    status: {
+      type: DataTypes.STRING,
+      allowNull: false,
+      defaultValue: 'wanted', // wanted | fulfilled
+    },
+    requestedBy: DataTypes.STRING,
+  }, {
+    sequelize,
+    modelName: 'Wanted',
+  });
+  return Wanted;
+};