refactor: reorganize test suite, add integration tests for NAT filter

- Move integration tests (api, network, phase2, smoke) to tests/integration/
- Move Playwright specs (captive-portal, interop-happy-path) to tests/e2e/
- Move playwright.config.mjs to tests/e2e/
- Fix hardcoded IP fallbacks: 192.168.4.1 → 10.192.45.1
- Add test-reset-auth.mjs: reset→pay→allow→revoke→block cycle
- Add test-session-expiry.mjs: pay→wait 65s→verify blocked (slow test)
- Add test-dns-firewall.mjs: DNS hijack/forward + per-client NAT filter
- Update Makefile with test-unit, test-integration, test-e2e, test-all targets
- Update package.json scripts for new paths
- Fix Playwright video: retain-on-failure instead of always-on
- Update AGENTS.md: per-client NAT filter description
- Update CHECKLIST.md: mark completed items, add Board B identity
- Board B nsec: 9af47906... → SSID TollGate-b96d80, AP IP 10.185.47.1
- 186 unit tests passing

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/helpers/network.mjs b/tests/helpers/network.mjs
index e4d5086..a2d889e 100644
--- a/tests/helpers/network.mjs
+++ b/tests/helpers/network.mjs
@@ -1,6 +1,6 @@
 import { execSync } from 'child_process';
 
-const ESP32_IP = process.env.TOLLGATE_IP || '192.168.4.1';
+const ESP32_IP = process.env.TOLLGATE_IP || '10.192.45.1';
 const TIMEOUT = 5000;
 
 export function curl(args, expectStatus = null) {