Add templates directory to Dockerfile for admin dashboard

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Dockerfile

@@ -14,6 +14,7 @@ COPY core/ ./core/
 COPY messaging/ ./messaging/
 COPY providers/ ./providers/
 COPY server.py ./
+COPY templates/ ./templates/
 COPY .env.example ./
 
 # Install dependencies