docs(readme): Update v0.2.1 release status - current version

Update README.md to reflect v0.2.1 as current released version:
✅ API Documentation (OpenAPI 3.0)
✅ Developer Guide (Bilingual DE/EN)
✅ Bundle Optimization (854KB → 508KB, 40% reduction)
✅ Bilingual Documentation (all major docs DE/EN)
✅ PDF Export fully functional

Release Status:
- v0.2.1 ✅ Released Dec 1, 2025
- v0.3.0 📋 Planned Q2 2026 (Calendar, Talk, Files, Deck)
- v1.0.0 �� Goal Q4 2026 (Production-Ready)

Updated both German and English sections of README

Author: Stefan

README.md

@@ -2,7 +2,7 @@
 
 Eine moderne, benutzerfreundliche **Nextcloud-App zur Verwaltung von Vereinen, Verbänden und Organisationen**. Mit vollständiger Mitglieder- und Finanzverwaltung.
 
-**Status**: v0.2.0-beta ✅ Released | **Aktuell**: v0.2.1 (In Arbeit) | **Lizenz**: AGPL-3.0 | **Nextcloud**: 28+
+**Status**: v0.2.1 ✅ **Released** | **Lizenz**: AGPL-3.0 | **Nextcloud**: 28+ | **Release**: 1. Dezember 2025
 
 ---
 
@@ -13,12 +13,49 @@ Eine moderne, benutzerfreundliche **Nextcloud-App zur Verwaltung von Vereinen, V
 | Version | Status | Release | Fokus |
 |---------|--------|---------|-------|
 | **v0.1.0-alpha** | ✅ Stabil | Nov 2025 | Basis CRUD, MVP |
-| **v0.2.0-beta** | ✅ **Released** | 30. Nov 2025 | RBAC, Admin-Panel, CSV/PDF Export, Statistics |
-| **v0.2.1** | 🔄 In Arbeit | Dez 2025 | API Docs, Developer Guide, Bugfixes |
-| **v0.3.0** | 📋 Geplant | Q2 2026 | Automatisierung, Integrationen |
-| **v1.0.0** | 🎯 Ziel | Q4 2026 | Production-Ready, 100% Test-Coverage |
-
-### 🆕 Was ist neu in v0.2.0-beta?
+| **v0.2.0-beta** | ✅ Released | 30. Nov 2025 | RBAC, Admin-Panel, CSV/PDF Export, Statistics |
+| **v0.2.1** | ✅ **Aktuell** | 1. Dez 2025 | API Docs, Developer Guide, Bundle-Optimierung |
+| **v0.3.0** | 📋 Geplant | Q2 2026 | Kalender, Talk, Files, Deck Integration |
+| **v1.0.0** | 🎯 Ziel | Q4 2026 | Production-Ready, App Store Release |
+
+### 🆕 Was ist neu in v0.2.1?
+
+✅ **API-Dokumentation (OpenAPI 3.0)** — Vollständig implementiert
+- Vollständige OpenAPI 3.0 Spezifikation
+- Interaktive Swagger-UI
+- Alle 31 API-Endpoints dokumentiert
+- Request/Response Beispiele für jeden Endpoint
+- docs/api/README.md mit detaillierten Specs
+
+✅ **Entwicklerhandbuch** — Vollständig implementiert
+- DEVELOPER_GUIDE.md mit Architektur-Übersicht
+- Service-Layer Patterns
+- Repository Pattern für Datenbank
+- Dependency Injection Best Practices
+- Migration Guides für zukünftige Versionen
+
+✅ **Bundle-Optimierung (40% Reduktion)** — Vollständig implementiert
+- @rollup/plugin-terser für aggressive Minifizierung
+- Bundle: 854KB → 508KB
+- Gzip: 197KB → 148KB (-25%)
+- Aggressive Minification: drop_console, mangle, compress
+- Optimale Performance für Endbenutzer
+
+✅ **Zweisprachige Dokumentation** — Vollständig implementiert
+- Alle wichtigen Docs jetzt DE/EN
+- DEVELOPER_GUIDE.md bilingual
+- API README.md bilingual
+- CONTRIBUTING.md bilingual
+- Konsistente Struktur in beiden Sprachen
+
+✅ **PDF-Export vollständig funktionsfähig** — Vollständig implementiert
+- TCPDF Integration funktioniert
+- Mitgliederlisten als PDF exportierbar
+- Gebührenlisten als PDF exportierbar
+- Professionelle Layouts mit Kopf- und Fußzeilen
+- Unicode-Support für Umlaute
+
+### Was kam in v0.2.0-beta?
 
 ✅ **Role-Based Access Control (RBAC)** — Vollständig implementiert
 - Admin, Kassierer, Mitglied Rollen
@@ -119,12 +156,49 @@ Eine moderne, benutzerfreundliche **Nextcloud-App zur Verwaltung von Vereinen, V
 | Version | Status | Release | Focus |
 |---------|--------|---------|-------|
 | **v0.1.0-alpha** | ✅ Stable | Nov 2025 | Basic CRUD, MVP |
-| **v0.2.0-beta** | ✅ 100% Complete | Dec 1, 2025 | RBAC, Admin Panel, CSV/PDF Export, Statistics |
-| **v0.2.1** | 📋 Planned | Q1 2026 | PDF Export, Bugfixes, Performance |
-| **v0.3.0** | 📋 Planned | Q2 2026 | Automation, Integrations |
-| **v1.0.0** | 🎯 Goal | Q4 2026 | Production-Ready, 100% Test Coverage |
-
-### 🆕 What's New in v0.2.0-beta?
+| **v0.2.0-beta** | ✅ Released | Nov 30, 2025 | RBAC, Admin Panel, CSV/PDF Export, Statistics |
+| **v0.2.1** | ✅ **Current** | Dec 1, 2025 | API Docs, Developer Guide, Bundle Optimization |
+| **v0.3.0** | 📋 Planned | Q2 2026 | Calendar, Talk, Files, Deck Integration |
+| **v1.0.0** | 🎯 Goal | Q4 2026 | Production-Ready, App Store Release |
+
+### 🆕 What's New in v0.2.1?
+
+✅ **API Documentation (OpenAPI 3.0)** — Fully Implemented
+- Complete OpenAPI 3.0 specification
+- Interactive Swagger UI
+- All 31 API endpoints documented
+- Request/response examples for every endpoint
+- docs/api/README.md with detailed specs
+
+✅ **Developer Guide** — Fully Implemented
+- DEVELOPER_GUIDE.md with architecture overview
+- Service-layer patterns
+- Repository pattern for database
+- Dependency injection best practices
+- Migration guides for future versions
+
+✅ **Bundle Optimization (40% Reduction)** — Fully Implemented
+- @rollup/plugin-terser for aggressive minification
+- Bundle: 854KB → 508KB
+- Gzip: 197KB → 148KB (-25%)
+- Aggressive minification: drop_console, mangle, compress
+- Optimal performance for end users
+
+✅ **Bilingual Documentation** — Fully Implemented
+- All major docs now DE/EN
+- DEVELOPER_GUIDE.md bilingual
+- API README.md bilingual
+- CONTRIBUTING.md bilingual
+- Consistent structure in both languages
+
+✅ **PDF Export Fully Functional** — Fully Implemented
+- TCPDF integration working properly
+- Member lists exportable as PDF
+- Fee lists exportable as PDF
+- Professional layouts with headers and footers
+- Unicode support for umlauts
+
+### What came in v0.2.0-beta?
 
 ✅ **Role-Based Access Control (RBAC)** — Fully Implemented
 - Admin, Treasurer, Member roles
@@ -279,37 +353,77 @@ sudo -u www-data php /var/www/nextcloud/occ app:enable verein
 
 ## 🎯 Roadmap — Deutsch
 
-### v0.1.0-alpha ✅ (Aktuell)
-- ✅ Basis Mitgliederverwaltung (CRUD)
-- ✅ Gebührenverwaltung (CRUD)
-- ✅ Responsive UI mit Dark Mode
-- ✅ Nextcloud Integration
+### v0.1.0-alpha ✅ (Stable)
+- ✅ Basic member management (CRUD)
+- ✅ Fee management (CRUD)
+- ✅ Responsive UI with dark mode
+- ✅ Nextcloud integration
 
-### v0.2.0-beta ✅ (100% fertig, Released 1. Dez 2025)
-- ✅ Rollen & Berechtigungen (RBAC)
-- ✅ Admin-Panel & Settings
-- ✅ Datenvalidierung (IBAN, BIC, Email)
-- ✅ CSV/PDF Export
-- ✅ 130+ Unit Tests (100% Pass-Rate)
+### v0.2.0-beta ✅ (Released Nov 30, 2025)
+- ✅ Roles & permissions (RBAC)
+- ✅ Admin panel & settings
+- ✅ Data validation (IBAN, BIC, Email)
+- ✅ CSV/PDF export
+- ✅ 130+ unit tests (100% pass rate)
+
+### v0.2.1 ✅ (Released Dec 1, 2025)
+- ✅ API Documentation (OpenAPI 3.0)
+- ✅ Developer Guide (Bilingual)
+- ✅ Bundle optimization (40% reduction)
+- ✅ PDF export fully functional
+- ✅ Bilingual documentation (DE/EN)
+
+### v0.3.0 📋 (Planned Q2 2026)
+- Kalender Integration (Konzertmeister Model)
+- Talk Integration (Event Management, RSVP)
+- Files Integration (Notenverwaltung nach SoftNote)
+- Deck Integration (Kanban Board)
+- DSGVO Compliance (Art. 6-34)
+
+### v1.0.0 🎯 (Goal Q4 2026)
+- Full stability & 100% test coverage
+- SEPA XML export for bank transfers
+- Comprehensive documentation & API documentation
+- Internationalization (i18n)
+- App Store release
 
-### v0.2.1 📋 (Q1 2026)
-- PDF Export Funktionalität (TCPDF Fix)
-- Bugfixes & Performance-Optimierung
-- Verbesserte Fehlerbehandlung
+---
 
-### v0.3.0 📋 (Q2 2026)
-- Automatische Mahnungen (Cronjob)
-- Benachrichtigungssystem (Email, Talk)
-- Kalender-Integration
-- Erweiterte Finanzberichte
+## 🎯 Roadmap — English
 
-### v1.0.0 🎯 (Q4 2026, Production)
-- Vollständige Stabilität & 100% Test-Coverage
-- SEPA XML Export für Bankentransfers
-- Umfangreiche Dokumentation & API-Doku
-- Internationalisierung (i18n)
+### v0.1.0-alpha ✅ (Stable)
+- ✅ Basic member management (CRUD)
+- ✅ Fee management (CRUD)
+- ✅ Responsive UI with dark mode
+- ✅ Nextcloud integration
 
----
+### v0.2.0-beta ✅ (Released Nov 30, 2025)
+- ✅ Roles & permissions (RBAC)
+- ✅ Admin panel & settings
+- ✅ Data validation (IBAN, BIC, Email)
+- ✅ CSV/PDF export
+- ✅ 130+ unit tests (100% pass rate)
+
+### v0.2.1 ✅ (Released Dec 1, 2025)
+- ✅ API Documentation (OpenAPI 3.0)
+- ✅ Developer Guide (Bilingual)
+- ✅ Bundle optimization (40% reduction)
+- ✅ PDF export fully functional
+- ✅ Bilingual documentation (DE/EN)
+
+### v0.3.0 📋 (Planned Q2 2026)
+- Calendar integration (Konzertmeister model)
+- Talk integration (event management, RSVP)
+- Files integration (note management like SoftNote)
+- Deck integration (Kanban board)
+- GDPR/DSGVO compliance (Art. 6-34)
+
+### v1.0.0 🎯 (Goal Q4 2026)
+- Full stability & 100% test coverage
+- SEPA XML export for bank transfers
+- Comprehensive documentation & API documentation
+- Internationalization (i18n)
+- App Store release
 
 ## 🎯 Roadmap — English