Fix script downloader placeholder files issue

- Delete stub scriptDownloader.js that contained placeholder implementation
- Implement real JavaScript script downloader with GitHub fetch functionality
- Fix incremental JSON sync to only process newly synced files
- Add proper error handling and file structure management
- Support all script types (ct/, tools/, vm/, vw/) with directory preservation
- Download install scripts for CT scripts
- Re-enable auto-sync service to use real implementation

Scripts now download real content from GitHub instead of placeholders.

src/server/api/routers/scripts.ts

@@ -1,9 +1,9 @@
 import { z } from "zod";
 import { createTRPCRouter, publicProcedure } from "~/server/api/trpc";
 import { scriptManager } from "~/server/lib/scripts";
-import { githubJsonService } from "~/server/services/githubJsonService.ts";
-import { localScriptsService } from "~/server/services/localScripts.ts";
-import { scriptDownloaderService } from "~/server/services/scriptDownloader.ts";
+import { githubJsonService } from "~/server/services/githubJsonService";
+import { localScriptsService } from "~/server/services/localScripts";
+import { scriptDownloaderService } from "~/server/services/scriptDownloader";
 import { AutoSyncService } from "~/server/services/autoSyncService";
 import type { ScriptCard } from "~/types/script";