feat: add creator verification routes

[zuru122]

#460

Summary

Adds creator verification API routes under app/api/routes-f/
verification/route.ts and app/api/routes-f/verification/admin/
route.ts.

This PR:

• Adds GET /api/routes-f/verification to return the authenticated
  creator’s current verification status: unverified, pending,
  verified, or rejected.
• Adds POST /api/routes-f/verification to submit a verification
  request with social_links, reason, and optional id_document_url.
• Prevents creators from resubmitting while their request is still
  pending.
• Adds GET /api/routes-f/verification/admin to list pending
  verification requests.
• Restricts the admin endpoint via an allowlist-based admin session
  check using VERIFICATION_ADMIN_USER_IDS or
  VERIFICATION_ADMIN_EMAILS.
• Keeps all implementation scoped exclusively to app/api/routes-f/
  verification/.

Implementation details:

• Introduces a dedicated creator_verification_requests table
  created on demand by the route helper in app/api/routes-f/
  verification/_shared.ts.
• Adds payload validation and normalization for social links and
  optional document URLs.
• Adds focused Jest coverage in app/api/routes-f/verification/
  tests/route.test.ts.

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