fix(docker): Make port configuration consistent and dynamic

Fixed the mismatch between environment variables:
- docker-compose now passes PORT (what NestJS/Next.js read) instead of API_PORT
- API_PORT/WEB_PORT control host mapping, PORT controls container

Changes:
- docker-compose: Pass PORT=${API_PORT} and PORT=${WEB_PORT} to containers
- docker-compose: Dynamic port mapping on both host and container sides
- docker-compose: Traefik labels use ${API_PORT}/${WEB_PORT} variables
- docker-compose: Healthchecks use PORT env var
- Dockerfiles: Removed hardcoded port values
- Dockerfiles: Healthchecks read PORT at runtime

This allows changing ports via API_PORT/WEB_PORT environment variables
and have all components (app, healthcheck, Traefik) use the correct port.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api/Dockerfile

@@ -80,12 +80,12 @@ WORKDIR /app/apps/api
 # Switch to non-root user
 USER nestjs
 
-# Expose API port
-EXPOSE 3001
+# Expose API port (default 3001, can be overridden via PORT env var)
+EXPOSE ${PORT:-3001}
 
-# Health check
+# Health check uses PORT env var (set by docker-compose or defaults to 3001)
 HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \
-  CMD node -e "require('http').get('http://localhost:3001/health', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})"
+  CMD node -e "const port = process.env.PORT || 3001; require('http').get('http://localhost:' + port + '/health', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})"
 
 # Use dumb-init to handle signals properly
 ENTRYPOINT ["dumb-init", "--"]