fixed 'internal structure' flow display within the document

docs/services/orchestration-service.md

@@ -33,6 +33,7 @@ or inference services — all traffic flows through orchestration.
 | QDRANT_URL | No | http://localhost:6333 | Qdrant URL for semantic search |
 
 ## Internal Structure
+```
 src/
 ├── services/
 │   ├── memory.js      # HTTP client for memory service
@@ -45,6 +46,7 @@ src/
 │   ├── chat.js        # POST /chat and POST /chat/stream route handlers
 │   └── sessions.js    # GET /sessions/:sessionId/history route handler
 └── index.js           # Express app entry point
+```
 
 The `services/` layer wraps all downstream HTTP calls in named functions,
 keeping the pipeline logic in `chat/index.js` readable and ensuring that