Eth.Ed web - Final Updates

[AyuShetty]

/- Performed security audit of git history (no secrets found)

• Verified environment variable isolation and updated .gitignore for .env*
• Updated navbar styling and logo CSS for light mode
• Replaced deprecated middleware.ts with proxy.ts
• Implemented security headers and role-based route protection in proxy
• Integrated Google and Apple OAuth providers with production credentials
• Created OAUTH_SETUP.md and OAUTH_QUICKSTART.md
• Added helper script for generating Apple JWT
• Restored email + name fallback login form
• Updated NextAuth configuration (SIWE, Google, Apple, email-name, admin credentials)
• Standardized sign-in, JWT, and session callbacks
• Ensured user sync with Supabase via Prisma (including role assignment)
• Implemented admin login flow with hidden trigger and modal
• Refined client-side UI (spinners, buttons, placeholders, modal styling)
• Updated .gitignore to exclude .p8 Apple private key and sensitive files