chore: disable scheduled GitHub Actions database builds

Database is now built on VPS via systemd timer at 02:00 UTC daily.
GitHub Actions workflow kept available for manual emergency use.

Benefits of VPS approach:
- No 6-hour GitHub Actions timeout limit
- 15,000/hour rate limit (vs 5,000 on GH Actions)
- Faster indexing with incremental mode
- Direct deployment to Docker container

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.github/workflows/build-database.yml

@@ -1,10 +1,11 @@
 name: Build Awesome Database
 
 on:
-  schedule:
-    # Run daily at 02:00 UTC
-    - cron: '0 2 * * *'
-  workflow_dispatch:  # Allow manual triggering
+  # Disabled: Database is now built on VPS via systemd timer
+  # schedule:
+  #   # Run daily at 02:00 UTC
+  #   - cron: '0 2 * * *'
+  workflow_dispatch:  # Allow manual triggering (kept for emergency use)
     inputs:
       index_mode:
         description: 'Indexing mode'