chore(01-01): scaffold monorepo, Docker Compose stack, and Vitest harness

- pnpm workspace with apps/api (Hono/Drizzle) and apps/pwa (Vite/React 19)
- Pinned versions per RESEARCH: hono@4.12.23, drizzle-orm@0.45.2, mysql2@3.22.4, tsdav@2.2.2, ical.js@2.2.1, zod@^3.25.0, node-cron@^4.2.1
- docker-compose.yml with mariadb:11 healthcheck, api depends_on service_healthy, redis stub
- docker-compose.dev.yml overrides for local dev (bind mounts, exposed ports)
- .env.example lists all env vars (DB_*, OIDC_*, APP_PASSWORD_ENCRYPTION_KEY)
- .gitignore excludes .env (never commit secrets)
- apps/api/vitest.config.ts with environment: node
- Wave 0 test stubs: health, auth/user, broker/crypto, broker/sync, broker/poller

apps/api/tests/broker/sync.test.ts

@@ -0,0 +1,29 @@
+/**
+ * Wave 0 stub — Broker: syncCalendar event upsert + all-day handling
+ *
+ * These tests are RED stubs. Implementation lives in:
+ *   apps/api/src/broker/sync.ts  (Plan 03)
+ *
+ * Tests will be filled GREEN in Plan 03 when syncCalendar is implemented.
+ *
+ * Key behaviors to verify (D-13):
+ *   - All-day events: dtstart_date (DATE) set, dtstart_utc NULL, allDay=true
+ *   - Timed events: dtstart_utc (TIMESTAMP UTC) set, dtstart_date NULL, allDay=false
+ *   - UID used as idempotency key: second sync of same UID is an upsert, not duplicate
+ */
+
+import { describe, it } from 'vitest'
+
+describe('syncCalendar', () => {
+  it.todo('stores all-day events with dtstart_date (DATE) and dtstart_utc=NULL (Plan 03)')
+
+  it.todo('stores timed events with dtstart_utc (TIMESTAMP) and dtstart_date=NULL (Plan 03)')
+
+  it.todo('sets allDay=true for all-day events, allDay=false for timed (Plan 03)')
+
+  it.todo('upserts on duplicate UID within the same calendar (Plan 03)')
+
+  it.todo('stores the raw VEVENT blob in rawVevent column (Plan 03)')
+
+  it.todo('updates the calendar ctag/syncToken after a successful sync (Plan 03)')
+})