Add Mode1 auth testing environment with token comparison verification

- Created Mode1 as self-contained test environment
- Added auth-module copy with self-contained configuration
- Implemented backend server with Graph token and PocketBase validation endpoints
- Added frontend test dashboard with token comparison functionality
- Fixed TypeScript compatibility issues (replaced import.meta.dir with __dirname)
- Implemented actual PB token validation in comparison endpoint (no placeholders)
- All endpoints tested and working with real tokens

Mode1/frontend/auth.ts

@@ -0,0 +1,3 @@
+// Frontend entry point - exports auth module for browser
+export { PocketBaseAuth, initPocketBaseAuth } from '../auth-module/frontend';
+export type { AuthConfig, AuthState, AuthCallbacks } from '../auth-module/types';