feat: better ratelimiting (#2520)

Replace hono-rate-limiter with a Prisma/PostgreSQL bucketed counter
approach that works correctly across multiple instances without sticky
sessions.

- Add RateLimit model with composite PK (key, action, bucket) and atomic
upsert
- Create rate limit factory with window parsing, bucket computation, and
fail-open
- Define auth-tier and API-tier rate limit instances
- Add Hono middleware, rateLimitResponse helper, and tRPC
assertRateLimit helper
- Wire rate limit headers through AppError constructor (was declared but
never assigned)
- Apply rate limits to auth routes (email-password, passkey), tRPC
routes
  (2FA email, link org account), API routes, and file upload endpoints
- Add cleanup cron job for expired rate limit rows (batched delete every
15 min)
- Remove hono-rate-limiter dependency

.github/workflows/e2e-tests.yml

@@ -41,6 +41,7 @@ jobs:
         env:
           # Needed since we use next start which will set the NODE_ENV to production
           NEXT_PRIVATE_SIGNING_LOCAL_FILE_PATH: './example/cert.p12'
+          DANGEROUS_BYPASS_RATE_LIMITS: 'true'
 
       - uses: actions/upload-artifact@v4
         if: always()