feat(p2p): OKX-level security upgrade with Edge Functions

- Add process-withdraw Edge Function for blockchain withdrawals
- Update verify-deposit Edge Function with @pezkuwi/api
- Add withdrawal limits (daily/monthly) and fee system
- Add hot wallet configuration with production address
- Add admin roles for dispute resolution
- Add COMBINED SQL migration with full P2P system
- Encrypt payment details with AES-256-GCM
- Prevent TX hash reuse with UNIQUE constraint

web/supabase/migrations/019_admin_roles_setup.sql

@@ -0,0 +1,61 @@
+-- =====================================================
+-- Migration 019: Admin Roles Setup
+-- Assigns admin roles for P2P dispute resolution
+-- =====================================================
+
+-- Super Admin: satoshiqazi@gmail.com
+-- Full access to all admin functions including dispute resolution
+INSERT INTO public.admin_roles (user_id, role, granted_by)
+SELECT
+  u.id,
+  'super_admin',
+  u.id
+FROM auth.users u
+WHERE u.email = 'satoshiqazi@gmail.com'
+ON CONFLICT (user_id) DO UPDATE SET
+  role = 'super_admin',
+  updated_at = NOW();
+
+-- Moderator: info@pezkuwichain.io
+-- Can view and resolve disputes
+INSERT INTO public.admin_roles (user_id, role, granted_by)
+SELECT
+  u.id,
+  'moderator',
+  (SELECT id FROM auth.users WHERE email = 'satoshiqazi@gmail.com')
+FROM auth.users u
+WHERE u.email = 'info@pezkuwichain.io'
+ON CONFLICT (user_id) DO UPDATE SET
+  role = 'moderator',
+  updated_at = NOW();
+
+-- Verify the setup
+DO $$
+DECLARE
+  v_super_admin_count INT;
+  v_moderator_count INT;
+BEGIN
+  SELECT COUNT(*) INTO v_super_admin_count
+  FROM admin_roles ar
+  JOIN auth.users u ON ar.user_id = u.id
+  WHERE u.email = 'satoshiqazi@gmail.com' AND ar.role = 'super_admin';
+
+  SELECT COUNT(*) INTO v_moderator_count
+  FROM admin_roles ar
+  JOIN auth.users u ON ar.user_id = u.id
+  WHERE u.email = 'info@pezkuwichain.io' AND ar.role = 'moderator';
+
+  IF v_super_admin_count = 1 THEN
+    RAISE NOTICE '✓ Super Admin assigned: satoshiqazi@gmail.com';
+  ELSE
+    RAISE WARNING '✗ Super Admin NOT found - user may not exist yet';
+  END IF;
+
+  IF v_moderator_count = 1 THEN
+    RAISE NOTICE '✓ Moderator assigned: info@pezkuwichain.io';
+  ELSE
+    RAISE WARNING '✗ Moderator NOT found - user may not exist yet';
+  END IF;
+END $$;
+
+COMMENT ON TABLE admin_roles IS 'Admin role assignments for P2P dispute resolution and platform management';