docs: update CLAUDE.md - Phase 2 complete

- Mark Feature-Enforcement Phase 2 as complete
- Add 4-phase model status overview
- Document feature_logger.py and JSON logging
- Update DB schema section with user_feature_usage

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

CLAUDE.md

@@ -21,8 +21,9 @@ Teil der **Jinkendo**-App-Familie (人拳道). Domains: jinkendo.de / .com / .li
 backend/
 ├── main.py          # App-Setup + Router-Registration (~75 Zeilen)
 ├── db.py            # PostgreSQL Connection Pool
-├── auth.py          # Hash, Verify, Sessions
+├── auth.py          # Hash, Verify, Sessions, Feature-Access-Control
 ├── models.py        # Pydantic Models
+├── feature_logger.py # Strukturiertes JSON-Logging (Phase 2)
 └── routers/         # 14 Router-Module
     auth · profiles · weight · circumference · caliper
     activity · nutrition · photos · insights · prompts
@@ -57,9 +58,16 @@ frontend/src/
 - PostgreSQL 16 · Modulare Router-Architektur
 - Membership-System: Tiers · Coupons · Access-Grants · Admin-UI
 - Export: CSV · JSON · ZIP
+- **Feature-Enforcement Phase 2:** Non-blocking Monitoring + JSON-Logging
+
+### Feature-Enforcement Status (4-Phasen-Modell)
+- ✅ **Phase 1:** Cleanup (Feature-Konsolidierung, Migration)
+- ✅ **Phase 2:** Non-blocking Monitoring (JSON-Logs, alle 9 Router)
+- 🔲 **Phase 3:** Frontend Display (Usage-Counter UI)
+- 🔲 **Phase 4:** Enforcement (Blocking aktivieren)
 
 ### Offen v9c 🔲
-- Feature-Enforcement (Rollback 20.03.2026 – Redesign nötig)
+- Feature-Enforcement Phase 3+4 (Frontend Display + Blocking)
 - Selbst-Registrierung + E-Mail-Verifizierung
 - Trial-System UI
 
@@ -114,7 +122,11 @@ ai_usage          – KI-Calls pro Tag pro Profil
 
 v9c neu (Membership):
 subscriptions · coupons · coupon_redemptions · features
-tier_limits · user_restrictions · access_grants · user_activity_log
+tier_limits · user_feature_restrictions · user_feature_usage
+access_grants · user_activity_log
+
+Feature-Logging (Phase 2):
+/app/logs/feature-usage.log  # JSON-Format, alle Feature-Zugriffe
 
 Schema-Datei: backend/schema.sql
 ```