feat(07-02): implement globalSetup — /health readiness gate + deterministic DB seed

- Poll baseURL/health with 60s timeout; throw on expiry (D-08 readiness gate)
- TRUNCATE list_items, list_shares, lists, calendar_events (FK checks toggled)
- INSERT IGNORE calendars guard for id=10 (Pitfall 4 CI resilience)
- Seed one timed calendar_event on calendar_id=10 (uid: e2e-seed-event-001)
- Seed E2E Grocery List (owner_id=1, is_shared=true) + list_shares + Milk/Eggs items
- Add mysql2@3.22.4 devDependency to apps/pwa (needed for global-setup types)
- No @playwright/test imports — plain Node.js only (Pitfall 2)

pnpm-lock.yaml

@@ -147,6 +147,9 @@ importers:
       jsdom:
         specifier: ^26.1.0
         version: 26.1.0
+      mysql2:
+        specifier: 3.22.4
+        version: 3.22.4(@types/node@22.19.19)
       typescript:
         specifier: ^5.5.0
         version: 5.9.3