Episode scripts: file by season + episode so numbers can repeat per book; search labels for current series; v2.9.6

- Scripts keyed "<season>-<episode>" (legacy ones migrate on first start; unseasoned ones keep their plain key)
- Season backfill handles episode numbers shared across seasons (title match fallback)
- Fix: "Backfill seasons from RSS" was swallowed by the upload route
- Global search labels script results with the title of the series playing now (both lanes), not just finished books

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

package.json

@@ -1,7 +1,7 @@
 {
   "name": "siteforge",
   "private": true,
-  "version": "2.9.5",
+  "version": "2.9.6",
   "type": "module",
   "scripts": {
     "dev": "vite",