fix: route P2P deposits and verification to Asset Hub instead of relay chain

DepositModal was building transactions via relay chain API, and all three
edge functions (verify-deposit, process-withdraw, process-withdrawal) had
RPC endpoints hardcoded or defaulting to the relay chain. This caused
deposit verification to fail with "Transaction not yet finalized" and
created a chain mismatch with the withdrawal system which operates on
Asset Hub.

- DepositModal: use assetHubApi instead of api for transfer TX
- verify-deposit: RPC_HTTP/RPC_WS default to asset-hub-rpc (env override)
- process-withdraw: RPC_ENDPOINT default to asset-hub-rpc (env override)
- process-withdrawal: RPC_ENDPOINT default to asset-hub-rpc

web/src/components/p2p/DepositModal.tsx

@@ -49,7 +49,7 @@ type DepositStep = 'select' | 'send' | 'verify' | 'success';
 
 export function DepositModal({ isOpen, onClose, onSuccess }: DepositModalProps) {
   const { t } = useTranslation();
-  const { api, selectedAccount } = usePezkuwi();
+  const { assetHubApi, isAssetHubReady, selectedAccount } = usePezkuwi();
   const { balances, signTransaction } = useWallet();
   const { identityId } = useP2PIdentity();
 
@@ -109,7 +109,7 @@ export function DepositModal({ isOpen, onClose, onSuccess }: DepositModalProps)
   };
 
   const handleSendDeposit = async () => {
-    if (!api || !selectedAccount) {
+    if (!assetHubApi || !isAssetHubReady || !selectedAccount) {
       toast.error(t('p2pDeposit.connectWallet'));
       return;
     }
@@ -129,12 +129,12 @@ export function DepositModal({ isOpen, onClose, onSuccess }: DepositModalProps)
 
       let tx;
       if (token === 'HEZ') {
-        // Native transfer
-        tx = api.tx.balances.transferKeepAlive(platformWallet, amountBN);
+        // Native transfer on Asset Hub
+        tx = assetHubApi.tx.balances.transferKeepAlive(platformWallet, amountBN);
       } else {
         // Asset transfer (PEZ = asset ID 1)
         const assetId = token === 'PEZ' ? 1 : 0;
-        tx = api.tx.assets.transfer(assetId, platformWallet, amountBN);
+        tx = assetHubApi.tx.assets.transfer(assetId, platformWallet, amountBN);
       }
 
       toast.info(t('p2pDeposit.signTransaction'));
@@ -146,7 +146,7 @@ export function DepositModal({ isOpen, onClose, onSuccess }: DepositModalProps)
         setTxHash(hash);
         // Capture approximate block number for faster verification
         try {
-          const header = await api.rpc.chain.getHeader();
+          const header = await assetHubApi.rpc.chain.getHeader();
           setBlockNumber(header.number.toNumber());
         } catch {
           // Non-critical - verification will still work via search

web/supabase/functions/process-withdraw/index.ts

@@ -26,8 +26,8 @@ function getCorsHeaders(origin: string | null) {
 // Platform hot wallet address
 const PLATFORM_WALLET = '5HN6sFM7TbPQazmfhJP1kU8itw7Tb2A9UML8TwSYRwiN9q5Z'
 
-// RPC endpoint
-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

web/supabase/functions/process-withdrawal/index.ts

@@ -28,7 +28,7 @@ import { cryptoWaitReady } from 'npm:@pezkuwi/util-crypto@14.0.11'
 const SUPABASE_URL = Deno.env.get("SUPABASE_URL")!;
 const SUPABASE_SERVICE_ROLE_KEY = Deno.env.get("SUPABASE_SERVICE_ROLE_KEY")!;
 const PLATFORM_WALLET_SEED = Deno.env.get("PLATFORM_WALLET_SEED")!;
-const RPC_ENDPOINT = Deno.env.get("RPC_ENDPOINT") || "wss://rpc.pezkuwichain.io";
+const RPC_ENDPOINT = Deno.env.get("RPC_ENDPOINT") || "wss://asset-hub-rpc.pezkuwichain.io";
 
 // Asset IDs
 const ASSET_IDS: Record<string, number | null> = {

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

@@ -28,9 +28,9 @@ function getCorsHeaders(origin: string | null) {
 // Platform hot wallet address (PRODUCTION) - Treasury_3
 const PLATFORM_WALLET = '5H18ZZBU4LwPYbeEZ1JBGvibCU2edhhM8HNUtFi7GgC36CgS'
 
-// RPC endpoints for PezkuwiChain
-const RPC_HTTP = 'https://rpc.pezkuwichain.io'
-const RPC_WS = 'wss://rpc.pezkuwichain.io'
+// RPC endpoints — defaults to Asset Hub where user balances live
+const RPC_HTTP = Deno.env.get('RPC_HTTP') || 'https://asset-hub-rpc.pezkuwichain.io'
+const RPC_WS = Deno.env.get('RPC_WS') || 'wss://asset-hub-rpc.pezkuwichain.io'
 
 // Token decimals
 const DECIMALS = 12