feat: Firebase Auth and Firestore user role-based route protection for restricted pages

[KemingHe]

@devosu/event-feed-project-leads Let's add a Security branch family and assign a dedicated team to implement route protection feature.

Key tech to consider:

• React context and providers (already pre-init the contexts dir for this).
• React guards (design pattern, no such imports from react).
• Use react-firehooks (already in package.json dep list).
  • DO NOT use the outdated react-firebase-hooks.
  • DO NOT write your own custom hooks.