refactor: Jitsi/Matrix/Voice von Core übernommen, Camunda/BPMN gelöscht, Kommunikation-Nav

- Voice-Service von Core nach Lehrer verschoben (bp-lehrer-voice-service)
- 4 Jitsi-Services + 2 Synapse-Services in docker-compose.yml aufgenommen
- Camunda komplett gelöscht: workflow pages, workflow-config.ts, bpmn-js deps
- CAMUNDA_URL aus backend-lehrer environment entfernt
- Sidebar: Kategorie "Compliance SDK" + "Katalogverwaltung" entfernt
- Sidebar: Neue Kategorie "Kommunikation" mit Video & Chat, Voice Service, Alerts

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

voice-service/pyproject.toml

@@ -0,0 +1,25 @@
+[project]
+name = "voice-service"
+version = "1.0.0"
+description = "BreakPilot Voice Service - Real-time Voice Processing"
+requires-python = ">=3.10"
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+python_files = ["test_*.py"]
+python_classes = ["Test*"]
+python_functions = ["test_*"]
+asyncio_mode = "auto"
+# Add current directory to PYTHONPATH so local modules are found
+pythonpath = ["."]
+
+[tool.coverage.run]
+source = ["."]
+omit = ["tests/*", "venv/*", "*/__pycache__/*"]
+
+[tool.coverage.report]
+exclude_lines = [
+    "pragma: no cover",
+    "if __name__ == .__main__.:",
+    "raise NotImplementedError",
+]