feat: initial commit — Curio mastery tutor

Full Next.js App Router application with:
- AI-graded lesson checkpoints (BKT/Elo mastery tracking)
- Auth.js v5: credentials, Google, GitHub, generic OIDC
- Anonymous-session-first with migrate-on-signin
- Admin panel: users, blueprints, reports, site settings
- Password reset + email verification (nodemailer/SMTP)
- Site config: require_auth + signups_enabled flags
- server-only guards on all DB/generation/verification modules
- PostgreSQL 16 + pgvector, Redis cache, Drizzle ORM
- 271 unit tests (Vitest), golden-eval harness, Playwright e2e stubs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,33 @@
+services:
+  postgres:
+    image: pgvector/pgvector:pg16
+    environment:
+      POSTGRES_DB: curio
+      POSTGRES_USER: curio
+      POSTGRES_PASSWORD: curio
+    ports:
+      - "5433:5432"
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+      - ./docker/init.sql:/docker-entrypoint-initdb.d/01_init.sql
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U curio"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+  redis:
+    image: redis:7-alpine
+    ports:
+      - "6379:6379"
+    volumes:
+      - redisdata:/data
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+volumes:
+  pgdata:
+  redisdata: