Initial project setup for PhaseFlow

Set up Next.js 16 project with TypeScript for a training decision app
that integrates menstrual cycle phases with Garmin biometrics for
Hashimoto's thyroiditis management.

Stack: Next.js 16, React 19, Tailwind/shadcn, PocketBase, Drizzle,
Zod, Resend, Vitest, Biome, Lefthook, Nix dev environment.

Includes:
- 7 page routes (dashboard, login, settings, calendar, history, plan)
- 12 API endpoints (garmin, user, cycle, calendar, overrides, cron)
- Core lib utilities (decision engine, cycle phases, nutrition, ICS)
- Type definitions and component scaffolding
- Python script for Garmin token bootstrapping
- Initial unit tests for cycle utilities

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.env.example

@@ -0,0 +1,21 @@
+# ABOUTME: Example environment variables for PhaseFlow.
+# ABOUTME: Copy to .env and fill in your values.
+
+# App
+APP_URL=https://phaseflow.yourdomain.com
+NODE_ENV=development
+
+# PocketBase
+POCKETBASE_URL=http://localhost:8090
+
+# Email (Resend)
+RESEND_API_KEY=re_xxxxxxxxxxxx
+EMAIL_FROM=phaseflow@yourdomain.com
+
+# Encryption (for Garmin tokens)
+# Generate with: openssl rand -hex 16
+ENCRYPTION_KEY=your-32-character-encryption-key
+
+# Cron secret (for protected endpoints)
+# Generate with: openssl rand -hex 32
+CRON_SECRET=your-cron-secret-here