fix: copy new modules in api-proxy Dockerfile

The server.js was updated to require('./logging'), require('./metrics'),
and require('./rate-limiter'), but the Dockerfile only copied server.js.
This caused the api-proxy container to crash on startup.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Mossaka

containers/api-proxy/Dockerfile

@@ -15,7 +15,7 @@ COPY package*.json ./
 RUN npm ci --omit=dev
 
 # Copy application files
-COPY server.js ./
+COPY server.js logging.js metrics.js rate-limiter.js ./
 
 # Create non-root user
 RUN addgroup -S apiproxy && adduser -S apiproxy -G apiproxy