Unique SSID/IP per board + captive detection fix + mint list in portal

- Derive unique SSID (TollGate-{MAC4}{MAC5}) and AP IP (10.{b5}.{subnet}.1)
  from factory MAC — boards no longer conflict
- Board A: TollGate-377C @ 10.55.85.1, Board B: TollGate-5050 @ 10.80.10.1
- Captive portal detection URIs return 200 with portal HTML (matching
  esp32-mesh working approach) instead of 302 redirect
- Dynamic AP IP in portal HTML via __AP_IP__ template substitution
- Supported mints section in portal page (shows mint URL, tap to copy)
- Fixed mint URL to testnut.cashu.space (was stale in SPIFFS)
- DoT reject server on port 853 for DNS-over-TLS fallback
- DNS hijack: NXDOMAIN for all non-A queries, no forwarding for unauthed
- Playwright tests updated for 200 response on detection URIs
- Phase 2 test suite: 20/21 pass (test 22 expiry ping route issue)
- Tests 25-27 deferred to Phase 3 (Board B as second client)

1 files changed, 7 insertions, 7 deletions

diff --git a/tests/captive-portal.spec.mjs b/tests/captive-portal.spec.mjs
index acd2a40..bc7a1fa 100644
--- a/tests/captive-portal.spec.mjs
+++ b/tests/captive-portal.spec.mjs
@@ -32,18 +32,18 @@ test.describe('Captive Portal - Phase 2', () => {
     await expect(btn).toHaveText(/Pay/);
   });
 
-  test('captive detection URIs return 302 redirect', async ({ request }) => {
+  test('captive detection URIs return portal HTML (200)', async ({ request }) => {
     const uris = ['/generate_204', '/hotspot-detect.html', '/canonical.html', '/success.txt'];
     for (const uri of uris) {
-      const resp = await request.fetch(`${PORTAL_URL}${uri}`, { maxRedirects: 0, ignoreHTTPSErrors: true });
-      expect(resp.status()).toBe(302);
-      const location = resp.headers()['location'];
-      expect(location).toBe('http://192.168.4.1/');
+      const resp = await request.fetch(`${PORTAL_URL}${uri}`);
+      expect(resp.status()).toBe(200);
+      const body = await resp.text();
+      expect(body).toContain('TollGate');
     }
   });
 
-  test('captive detection redirects to portal page', async ({ page }) => {
-    await page.goto(`${PORTAL_URL}/generate_204`);
+  test('catch-all URIs redirect to portal page', async ({ page }) => {
+    await page.goto(`${PORTAL_URL}/some-random-page`);
     await expect(page.locator('h1')).toHaveText('TollGate');
   });