修复 Docker 构建 + 端口可配置

- Dockerfile 设置 GOPROXY=https://goproxy.cn,direct 解决国内网络问题
- 新增 addr 配置项，支持自定义端口，默认 :8080
- docker-compose 端口改为 ${OPS_MCP_PORT:-9090}
- 移除 EXPOSE 指令（端口通过 compose 管理）

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

internal/server/server.go

@@ -16,7 +16,7 @@ import (
 const version = "0.1.0"
 
 // Run 启动 MCP Server。
-func Run(transport string, tools ...tool.Tool) error {
+func Run(transport, addr string, tools ...tool.Tool) error {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
@@ -60,8 +60,8 @@ func Run(transport string, tools ...tool.Tool) error {
 		slog.Info("starting MCP server", "transport", "stdio")
 		return server.ServeStdio(mcpServer)
 	case "sse":
-		slog.Info("starting MCP server", "transport", "sse", "addr", ":8080")
-		return server.NewSSEServer(mcpServer).Start(":8080")
+		slog.Info("starting MCP server", "transport", "sse", "addr", addr)
+		return server.NewSSEServer(mcpServer).Start(addr)
 	default:
 		return fmt.Errorf("unknown transport: %s", transport)
 	}