fix(api): use ContractEventPayload.log.transactionHash in base watcher

The ethers v6 contract.on() listener receives ContractEventPayload as
its last argument, not EventLog. Accessing event.transactionHash
returned undefined, which then propagated into db.getPaymentByTxHash
and triggered sql.js's "tried to bind a value of an unknown type
(undefined)" error — so live VpnPayment events were silently dropped
and payments never provisioned.

Switch the listener to read event.log.transactionHash. The catch-up
scanner was already correct (queryFilter returns EventLog), so on
restart it will retroactively pick up any events the live listener
missed within the 1000-block lookback window.

Also gitignore .test-wallet.json (local throwaway key file).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: 2 people

.gitignore

@@ -29,3 +29,4 @@ wallets.env
 
 # Memory (local session state)
 memory/
+.test-wallet.json

api/src/base-watcher.ts

@@ -110,10 +110,10 @@ export function startBaseWatcher(
         numDays: bigint,
         amount: bigint,
         _timestamp: bigint,
-        event: ethers.EventLog,
+        event: ethers.ContractEventPayload,
       ) => {
         try {
-          await processPaymentEvent(agentId, Number(numDays), amount, event.transactionHash, db, config, operator);
+          await processPaymentEvent(agentId, Number(numDays), amount, event.log.transactionHash, db, config, operator);
         } catch (err) {
           console.error('[x402] Error processing payment event:', err);
         }