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>

scripts/garmin_auth.py

@@ -0,0 +1,37 @@
+#!/usr/bin/env python3
+# ABOUTME: PhaseFlow Garmin Token Generator using garth library.
+# ABOUTME: Run this locally to authenticate with Garmin (supports MFA).
+"""
+PhaseFlow Garmin Token Generator
+Run this locally to authenticate with Garmin (supports MFA)
+
+Usage:
+    pip install garth
+    python3 garmin_auth.py
+"""
+import json
+from getpass import getpass
+
+try:
+    import garth
+except ImportError:
+    print("Error: garth library not installed.")
+    print("Please install it with: pip install garth")
+    exit(1)
+
+email = input("Garmin email: ")
+password = getpass("Garmin password: ")
+
+# MFA handled automatically - prompts if needed
+garth.login(email, password)
+
+tokens = {
+    "oauth1": garth.client.oauth1_token.serialize(),
+    "oauth2": garth.client.oauth2_token.serialize(),
+    "expires_at": garth.client.oauth2_token.expires_at.isoformat()
+}
+
+print("\n--- Copy everything below this line ---")
+print(json.dumps(tokens, indent=2))
+print("--- Copy everything above this line ---")
+print(f"\nTokens expire: {tokens['expires_at']}")