feat(frontend): align wUSDT Asset ID with SDK (1000)

This commit aligns the frontend wUSDT implementation with the SDK runtime
constants, ensuring consistency across the entire stack.

Changes:
- Update ASSET_IDS.WUSDT from 2 → 1000 (matches SDK constants)
- Add ASSET_CONFIGS with wUSDT configuration (6 decimals, min balance)
- Update all asset queries in AccountBalance.tsx to use ASSET_IDS.WUSDT
- Update pool queries for wHEZ/wUSDT and PEZ/wUSDT pools
- Update USDTBridge.tsx burn transaction to use ASSET_IDS.WUSDT
- Refactor usdt.ts to reference ASSET_CONFIGS instead of hardcoded values

Asset ID Allocation Strategy:
- 0-999: Reserved for protocol tokens (wHEZ, PEZ, etc.)
- 1000+: Bridged/wrapped external assets (wUSDT, etc.)

Technical Details:
- wUSDT uses 6 decimals (USDT standard), not 12 like native HEZ
- All frontend code now uses centralized ASSET_CONFIGS
- ESLint passes with 0 errors (8 pre-existing warnings unrelated to changes)

This is part of Phase 1 wUSDT infrastructure setup, working in parallel
with SDK benchmarking builds currently running in background.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

web/src/components/USDTBridge.tsx

@@ -15,6 +15,7 @@ import {
   formatWUSDT,
 } from '@pezkuwi/lib/usdt';
 import { isMultisigMember } from '@pezkuwi/lib/multisig';
+import { ASSET_IDS } from '@pezkuwi/lib/wallet';
 
 interface USDTBridgeProps {
   isOpen: boolean;
@@ -115,7 +116,7 @@ export const USDTBridge: React.FC<USDTBridgeProps> = ({
 
       // Burn wUSDT
       const amountBN = BigInt(Math.floor(amount * 1e6)); // 6 decimals
-      const burnTx = api.tx.assets.burn(2, selectedAccount.address, amountBN.toString());
+      const burnTx = api.tx.assets.burn(ASSET_IDS.WUSDT, selectedAccount.address, amountBN.toString());
 
       await burnTx.signAndSend(selectedAccount.address, { signer: injector.signer }, ({ status }) => {
         if (status.isFinalized) {