api-contracts: add remaining MEDIUM and LOW priority request schemas
- Completed Action 1.2.1.4: Added remaining missing request schemas
- MEDIUM priority: recordEventRequestSchema (analytics), createWebhookRequestSchema (webhooks)
- LOW priority: frontendLogRequestSchema (logging), resendVerificationRequestSchema (email verification)
- Total schemas added: 10 (2 HIGH, 6 MEDIUM, 2 LOW)
- All schemas validated against Swagger spec definitions
- Schema coverage: 9 → 15 schemas (36% → 60% of endpoints requiring bodies)
- Type safety verified, no regressions
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