fix(seerr): add main.mediaServerType to settings.json to prevent crash

Seerr's checkOverseerrMerge calls Settings.load with raw=true, which
replaces this.data entirely with file contents. If settings.main is
absent (as in our jellyfin-only restore), it crashes at line 418:
'Cannot read properties of undefined (reading apiKey)'.

restore.js now ensures settings.main exists and mediaServerType=JELLYFIN,
which both prevents the crash and causes checkOverseerrMerge to return
early (migration already done).

servers/legion/k8s/media/overseerr.yaml

@@ -29,14 +29,26 @@ data:
     if (fs.existsSync(SETTINGS)) {
       try { settings = JSON.parse(fs.readFileSync(SETTINGS, 'utf8')); } catch(e) {}
     }
+    // Seerr's Settings.load runs in raw mode during the overseerrMerge check,
+    // which replaces this.data entirely with the file contents. If settings.main
+    // is absent, it crashes at "this.data.main.apiKey" (settings/index.js:418).
+    // Ensure main exists with mediaServerType=JELLYFIN so the merge check is skipped.
+    if (!settings.main) {
+      settings.main = {};
+    }
+    if (!settings.main.mediaServerType) {
+      settings.main.mediaServerType = 'JELLYFIN';
+      console.log('Set main.mediaServerType = JELLYFIN');
+    }
     if (!settings.jellyfin || !settings.jellyfin.apiKey) {
       console.log('Jellyfin apiKey missing — restoring from defaults');
       settings.jellyfin = JSON.parse(fs.readFileSync(DEFAULTS, 'utf8'));
-      fs.writeFileSync(SETTINGS, JSON.stringify(settings, null, 2));
       console.log('Restored Jellyfin config');
     } else {
       console.log('Jellyfin config present, skipping restore');
     }
+    fs.writeFileSync(SETTINGS, JSON.stringify(settings, null, 2));
+    console.log('Settings written successfully');
 ---
 apiVersion: apps/v1
 kind: Deployment