refactor: remove deprecated servers/grpcs in v2

[kooksee]

Summary

• 删除 servers/grpcs 废弃别名包（仓库内无引用，仅为 gatewayserver 薄包装）
• 同步更新架构文档、legacy-removal.md 清单与 Traefik 注释
• Breaking：外部项目若仍 import .../servers/grpcs，需改为 servers/gatewayserver

迁移

// 旧
import "github.com/pubgo/lava/v2/servers/grpcs"
grpcs.New(params)

// 新
import "github.com/pubgo/lava/v2/servers/gatewayserver"
gatewayserver.New(params)
// 或需 legacy supervisor 名 grpc-server 时：
gatewayserver.NewWithName(params, "grpc-server")

YAML 键 grpc_server 仍可通过 gatewayserver.LoadConfig 解析（带废弃警告），本次未动。

Test plan

• go test ./... -short -race

Note

与 #150 文档统一有重叠；合并本 PR 后可关闭 #150 或将其 rebase 掉重复 diff。

Made with Cursor

[gemini-code-assist]

Code Review

This pull request completely removes the deprecated servers/grpcs package (which served as an alias for gatewayserver) and updates all related documentation, configuration files, and Copilot instructions to reference servers/gatewayserver instead. There are no review comments, so no feedback is provided.

Important

The consumer version of Gemini Code Assist on GitHub is being sunset. Starting June 18, 2026, new organization installations will be blocked, and all code review activity will officially cease on July 17, 2026.
For more details on the timeline and next steps, please review the Help Documentation.