Add CORS support and Docker configuration for web service

- Added CORS allowed origins in config.compose.yaml to enable cross-origin requests from the web service.
- Updated docker-compose.yml to include a new web service with build context and port mapping for local development.
- Enhanced gateway.go to support additional HTTP methods in CORS responses.
- Updated README.md to document the new web service and its configuration requirements.

docker-compose.yml

@@ -1,4 +1,13 @@
 services:
+  web:
+    build:
+      context: ./web
+      dockerfile: Dockerfile
+      args:
+        # URL шлюза в браузере (встраивается при сборке)
+        PUBLIC_TELEMT_GATEWAY_URL: http://127.0.0.1:8080
+    ports:
+      - "4173:4173"
   gateway:
     image: git.shts.su/denozord/telemt-api:latest
     # Локальная сборка вместо pull: укажите build: . и image: telemt-api-gateway:local