feat: per-forward worker 模型 — 每条转发独立 frpc 配置+独立进程

核心改动（ring 协议不变，Task 本来就是 {Local,Remote,Link} 三元组）:
- process.WorkerKey: worker 键改为 'local~remote~port' 三元组
- renderForward: 每条 forward 渲染只含 1 个 proxy 的独立 frpc 配置
  (替代 renderRemote 把该 remote 全部 forwards 塞进一个进程)
- ClaimFn/RevokeFn: 认领/撤销只操作这一条 forward 自己的进程
- SyncWorkers/auto-start: 只拉起 localOnly 转发的独立进程,
  集群转发由 ring 认领节点拉起 (消除三台争抢 proxy already exists)
- RemoteStatus/StartRemote/StopRemote/RestartRemote: remote 级聚合辅助,
  保持 /profiles API 形状不变, 前端零改动
- handleStatus/logs: 按 worker key 解析真实 remote 名

效果: 三台节点的 frpc 各自只注册自己拥有的 proxy, 单条转发故障不再波及兄弟

internal/httpapi/handlers_logs.go

@@ -6,6 +6,8 @@ import (
 	"net/http"
 	"sync"
 	"time"
+
+	"webui4frpc/internal/process"
 )
 
 // workerLog is one frpc worker's log tail on a node.
@@ -34,8 +36,13 @@ func (h *Handler) localWorkerLogs() nodeLogsResp {
 	for _, name := range h.Process.ListWorkers() {
 		st, _ := h.Process.Status(name)
 		lines, _ := tailFile(h.Process.LogPath(name), 64*1024)
+		// Parse the worker key to get the real remote name for display.
+		remoteName := name
+		if _, r, _, ok := process.ParseWorkerKey(name); ok {
+			remoteName = r
+		}
 		out.Workers = append(out.Workers, workerLog{
-			Name: name, Remote: name, State: st.State, Lines: lines,
+			Name: name, Remote: remoteName, State: st.State, Lines: lines,
 		})
 	}
 	return out