feat(19-05): global-setup local_credentials seed + login.spec.ts + CI harness env

- global-setup.ts: TRUNCATE local_credentials + seed devuser/devpass (PHC scrypt inline)
- Create login.spec.ts: real-login-form e2e (gate redirect, wrong-password error, correct login)
- ci.yml: add LOCAL_SESSION_SECRET dev value + local_credentials seed step in harness job
- Fix all test mocks: add devSessionCookieMiddleware no-op to vi.mock(devBypass.js) blocks
  in admin/setup/push/lists/localAuth/authMode/requireAdmin tests (Rule 1 - Bug: missing export)
- Full API suite: 446/446 tests pass; pnpm typecheck: exit 0

apps/api/tests/routes/setup.test.ts

@@ -101,6 +101,8 @@ vi.mock('../../src/auth/devBypass.js', () => ({
       // No user injection for setup routes — pre-auth surface
       await next();
     },
+  // Phase 19 Option C: devSessionCookieMiddleware is a no-op in tests
+  devSessionCookieMiddleware: () => async (_c: unknown, next: () => Promise<void>) => next(),
 }));
 
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