feat: P2P E2E test suite + edge function RPC fix + balance tx constraint update

- Fix process-withdraw and verify-deposit-telegram to use RPC_ENDPOINT
  env var defaulting to Asset Hub (wss://asset-hub-rpc.pezkuwichain.io)
- Add P2P E2E test script (scripts/p2p-e2e-test.py) covering full flow:
  offer creation, trade accept, payment, escrow release, cancel, visa
  user trade, and withdrawal request
- Update p2p_balance_transactions transaction_type check constraint
  to include withdraw_lock, withdraw_complete, dispute_refund

supabase/functions/process-withdraw/index.ts

@@ -26,8 +26,8 @@ function getCorsHeaders(origin: string | null): Record<string, string> {
   };
 }
 
-// RPC endpoint for PezkuwiChain
-const RPC_ENDPOINT = 'wss://rpc.pezkuwichain.io';
+// RPC endpoint — defaults to Asset Hub where user balances live
+const RPC_ENDPOINT = Deno.env.get('RPC_ENDPOINT') || 'wss://asset-hub-rpc.pezkuwichain.io';
 
 // Token decimals
 const DECIMALS = 12;

supabase/functions/verify-deposit-telegram/index.ts

@@ -28,8 +28,8 @@ function getCorsHeaders(origin: string | null): Record<string, string> {
 // Platform hot wallet address (PRODUCTION) - Treasury_3
 const PLATFORM_WALLET = '5H18ZZBU4LwPYbeEZ1JBGvibCU2edhhM8HNUtFi7GgC36CgS';
 
-// RPC endpoint for PezkuwiChain
-const RPC_ENDPOINT = 'wss://rpc.pezkuwichain.io';
+// RPC endpoint — defaults to Asset Hub where user balances live
+const RPC_ENDPOINT = Deno.env.get('RPC_ENDPOINT') || 'wss://asset-hub-rpc.pezkuwichain.io';
 
 // Token decimals
 const DECIMALS = 12;

supabase/migrations/20260223_update_balance_tx_types.sql

@@ -0,0 +1,23 @@
+-- Update p2p_balance_transactions transaction_type check constraint
+-- Add new types needed for full P2P flow:
+--   withdraw_lock: when user requests withdrawal, balance moves available -> locked
+--   withdraw_complete: when withdrawal is processed on-chain
+--   dispute_refund: admin refunds during dispute resolution
+
+ALTER TABLE p2p_balance_transactions
+  DROP CONSTRAINT p2p_balance_transactions_transaction_type_check;
+
+ALTER TABLE p2p_balance_transactions
+  ADD CONSTRAINT p2p_balance_transactions_transaction_type_check
+  CHECK (transaction_type = ANY (ARRAY[
+    'deposit',
+    'withdraw',
+    'withdraw_lock',
+    'withdraw_complete',
+    'escrow_lock',
+    'escrow_release',
+    'escrow_refund',
+    'trade_receive',
+    'dispute_refund',
+    'admin_adjustment'
+  ]));