fix: workbox precache conflict + clean up duplicate API routes

- Exclude assets/icon/** from workbox globPatterns (already in includeAssets)
- Remove duplicate /api/* and /aiui/api/web-search routes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

neode-ui/mock-backend.js

@@ -1016,13 +1016,6 @@ app.get('/app/filebrowser/api/raw/*', (req, res) => {
   }
 })
 
-// =============================================================================
-// AIUI Web Search stub (demo mode — no real search backend)
-// =============================================================================
-app.get('/aiui/api/web-search', (req, res) => {
-  res.json({ results: [] })
-})
-
 // Claude API Proxy (reads ANTHROPIC_API_KEY from environment)
 // =============================================================================
 import https from 'https'
@@ -1097,11 +1090,6 @@ app.all('/aiui/api/*', (req, res) => {
   res.status(404).json({ error: 'Not available in demo mode' })
 })
 
-// General /api/ catch-all
-app.all('/api/*', (req, res) => {
-  res.status(404).json({ error: 'Not found' })
-})
-
 // Health check
 app.get('/health', (req, res) => {
   res.status(200).send('healthy')