fix: resolve admin white screen via static ChatWindowProvider import

- Statically declare ChatWindowProvider in payload.config.ts admin.components.providers
- Regenerate importMap.js with correct component mappings
- Update Dockerfile to support _at-mintel monorepo sync for local builds
- Add .gitignore entries for manual build artifacts
- Update blocks and collections (payload-ai integration updates)
- Sync pnpm-lock.yaml

.gitignore

@@ -56,4 +56,8 @@ apps/web/out/estimations/
 # Backups
 backups/
 
-.turbo
+.turbo
+# Manual build artifacts
+_at-mintel/
+local_build_*.log
+*.tar