docs: vollständige Projektdokumentation hinzugefügt

- docs/api.md: komplette API-Referenz (1375 Zeilen, alle Endpunkte)
- docs/architecture.md: Tech-Stack, DB-Schema, RLS-Architektur, Auth-Flow
- docs/deployment.md: Setup, nginx, systemd, update.sh, Backup/Rollback
- docs/development.md: Dev-Setup, Test-Workflow, Code-Konventionen, Fallstricke

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

frontend/DEVLOG.md

@@ -429,3 +429,25 @@ Keine Commits in dieser Session.
 Keine Änderungen ermittelbar.
 
 ---
+## 2026-05-23 22:38 – 22:42 (3m)
+**Beschreibung:** Claude Code Session
+**Projekt:** timemaster
+
+### Commits
+Keine Commits in dieser Session.
+
+### Geänderte Dateien
+- DEVLOG.md                                          |  16 ++
+- backend/app/routers/absences.py                    |  10 -
+- backend/app/routers/caldav.py                      |   2 -
+- backend/app/routers/kiosk.py                       |   3 -
+- backend/app/routers/ldap.py                        |   2 -
+- backend/app/routers/projects.py                    |   2 -
+- backend/app/routers/smtp.py                        |   1 -
+- backend/app/routers/time_entries.py                |  10 -
+- backend/migrations/env.py                          |   4 -
+- .../migrations/versions/0024_row_level_security.py | 223 +++++----------------
+- backend/tests/conftest.py                          |  48 +++++
+- backend/tests/test_rls.py                          | 190 ++++++++++++++++++
+
+---