Update Mihomo configuration and documentation for clarity

- Revised comments in `config.example.yaml` to enhance understanding of Mihomo integration, including environment variable usage and Docker Compose setup.
- Updated `docker-compose.yml` comments to clarify the relationship between the gateway and Mihomo service.
- Enhanced `GATEWAY_RUN.md` to provide clearer instructions on configuring Mihomo parameters and their usage in the gateway.

docker-compose.yml

@@ -8,13 +8,11 @@ services:
       - ./config.compose.yaml:/etc/telemt-gateway/config.yaml:ro
     environment:
       CONFIG_PATH: /etc/telemt-gateway/config.yaml
-      # Опционально: Mihomo в той же Docker-сети, что и gateway (см. docs/GATEWAY_RUN.md)
-      # MIHOMO_CONTROLLER_URL: http://mihomo:9090
-      # TELEMT_MIHOMO_AUTH: Bearer ${CLASH_SECRET}
+      # Вместе с Mihomo в config.yaml: TELEMT_MIHOMO_AUTH: Bearer ${CLASH_SECRET}
     # Доступ к Telemt на хосте Linux (host.docker.internal в config.compose.yaml):
     extra_hosts:
       - "host.docker.internal:host-gateway"
-    # При необходимости подключите к сети с контейнером Mihomo:
+    # С контейнером mihomo в сети proxy-net:
     # networks:
     #   - proxy-net
 # networks: