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/Dockerfile

@@ -0,0 +1,59 @@
+# Voice Service - PersonaPlex + TaskOrchestrator Integration
+# DSGVO-konform, keine Audio-Persistenz
+FROM python:3.11-slim-bookworm
+
+# Build arguments
+ARG TARGETARCH
+
+# Install system dependencies for audio processing
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    # Build essentials
+    build-essential \
+    gcc \
+    g++ \
+    # Audio processing
+    libsndfile1 \
+    libportaudio2 \
+    ffmpeg \
+    # Network tools
+    curl \
+    wget \
+    # Clean up
+    && rm -rf /var/lib/apt/lists/*
+
+# Create app directory
+WORKDIR /app
+
+# Create non-root user for security
+RUN groupadd -r voiceservice && useradd -r -g voiceservice voiceservice
+
+# Create data directories (sessions are transient, not persisted)
+RUN mkdir -p /app/data/sessions /app/personas \
+    && chown -R voiceservice:voiceservice /app
+
+# Copy requirements first for better caching
+COPY requirements.txt .
+
+# Install Python dependencies
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application code
+COPY --chown=voiceservice:voiceservice . .
+
+# Create __init__.py files for Python packages
+RUN touch /app/api/__init__.py \
+    && touch /app/services/__init__.py \
+    && touch /app/models/__init__.py
+
+# Switch to non-root user
+USER voiceservice
+
+# Expose port
+EXPOSE 8091
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=60s --retries=3 \
+    CMD curl -f http://localhost:8091/health || exit 1
+
+# Start application
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8091"]