Revert "feat: add persistent Deno cache to Railway executor for faster tool loading"

This reverts commit eb8a5ff91e.

apps/railway-executor/server.ts

@@ -104,14 +104,7 @@ async function loadAndDescribe(req: Request): Promise<Response> {
     } else {
       // Dynamic import from esm.sh (Deno supports this natively!)
       const url = importUrl || `https://esm.sh/${packageName}@${version}`;
-
-      // Log cache status for visibility
-      const isFirstImport = !moduleCache.has(cacheKey);
-      if (isFirstImport) {
-        console.log(`📦 Importing from network (will be cached by Deno): ${url}`);
-      } else {
-        console.log(`✅ Using in-memory cache: ${url}`);
-      }
+      console.log(`📦 Importing: ${url}`);
 
       const module = await import(url);
       let rawExport = module[exportName];