feat(matrix): add Matrix Ollama Bot service

GDPR-compliant replacement for telegram-ollama-bot using Matrix protocol:

New service: services/matrix-ollama-bot/
- NestJS application with matrix-bot-sdk
- Same functionality as telegram-ollama-bot
- Commands: !help, !models, !model, !mode, !clear, !status
- System prompts: default, classify, summarize, translate, code
- Chat history per user (last 10 messages)

Changes:
- docker-compose.macmini.yml: Added matrix-ollama-bot service
- health-check.sh: Added Matrix Ollama Bot health check

Environment variables required:
- MATRIX_OLLAMA_BOT_TOKEN: Bot access token
- MATRIX_OLLAMA_BOT_ROOMS: Optional room restrictions

https://claude.ai/code/session_01E3r5aFW3YLAhEJfsL2ryhv

docker-compose.macmini.yml

@@ -803,6 +803,38 @@ services:
       timeout: 10s
       retries: 3
 
+  # ============================================
+  # Matrix Ollama Bot (GDPR-compliant AI Chat)
+  # ============================================
+
+  matrix-ollama-bot:
+    image: ghcr.io/memo-2023/matrix-ollama-bot:latest
+    container_name: manacore-matrix-ollama-bot
+    restart: always
+    depends_on:
+      synapse:
+        condition: service_healthy
+    environment:
+      NODE_ENV: production
+      PORT: 3311
+      TZ: Europe/Berlin
+      MATRIX_HOMESERVER_URL: http://synapse:8008
+      MATRIX_ACCESS_TOKEN: ${MATRIX_OLLAMA_BOT_TOKEN}
+      MATRIX_ALLOWED_ROOMS: ${MATRIX_OLLAMA_BOT_ROOMS:-}
+      OLLAMA_URL: http://host.docker.internal:11434
+      OLLAMA_MODEL: ${OLLAMA_MODEL:-gemma3:4b}
+      OLLAMA_TIMEOUT: 120000
+    volumes:
+      - matrix_ollama_bot_data:/app/data
+    ports:
+      - "3311:3311"
+    healthcheck:
+      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://127.0.0.1:3311/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 40s
+
   # ============================================
   # Auto-Update (Watchtower)
   # ============================================
@@ -843,3 +875,5 @@ volumes:
     name: manacore-n8n
   synapse_data:
     name: manacore-synapse
+  matrix_ollama_bot_data:
+    name: manacore-matrix-ollama-bot