fix(docker): add custom LLM provider env variables

DOCKER.md

@@ -28,6 +28,11 @@ The easiest way to get OpenSpace running is using `docker-compose`.
    # OPENSPACE_API_KEY=your_key
    # OPENAI_API_KEY=your_key
    # ANTHROPIC_API_KEY=your_key
+   
+   # Optionally, configure custom LLM models/providers:
+   # OPENSPACE_MODEL=deepseek/deepseek-chat
+   # OPENSPACE_LLM_API_KEY=sk-xxxx
+   # OPENSPACE_LLM_API_BASE=https://api.deepseek.com/v1
    ```
 
 3. **Build and Run:**

docker-compose.yml

@@ -15,6 +15,9 @@ services:
       - OPENSPACE_API_KEY=${OPENSPACE_API_KEY:-}
       - OPENAI_API_KEY=${OPENAI_API_KEY:-}
       - ANTHROPIC_API_KEY=${ANTHROPIC_API_KEY:-}
+      - OPENSPACE_MODEL=${OPENSPACE_MODEL:-}
+      - OPENSPACE_LLM_API_KEY=${OPENSPACE_LLM_API_KEY:-}
+      - OPENSPACE_LLM_API_BASE=${OPENSPACE_LLM_API_BASE:-}
     restart: unless-stopped
 
 volumes: