chore: v0.1.1 — 版本号收拢进 internal/version + 发布脚本校验和覆盖安装包

- 新增 internal/version 包作为版本号唯一来源，release.sh 通过
  -ldflags -X 注入真实 tag。此前 /api/manager/status 与集群 JoinInfo
  里各自硬编码 "0.1.0"，产物报告的版本与 tag 无关。
- release.sh：SHA256SUMS 移到原生安装包构建之后统一重算，覆盖
  deb/rpm/setup.exe/pkg。此前只算 tar.gz/zip，用户校验安装包会得到
  "no file was verified"（v0.1.0 发布时实际踩到）。
- rpm spec / build_installers.sh 默认版本与 changelog、README 安装
  示例文件名同步到 0.1.1。

验证：go test ./internal/cluster/... ./internal/httpapi/... 通过；
6 平台产物架构逐个 file 校验正确；linux-amd64 实跑 /status 报告
version=0.1.1（确认 ldflags 注入生效）。

internal/httpapi/server.go

@@ -20,6 +20,7 @@ import (
 	"webui4frpc/internal/cluster"
 	"webui4frpc/internal/process"
 	"webui4frpc/internal/store"
+	"webui4frpc/internal/version"
 )
 
 //go:embed all:dist
@@ -413,7 +414,7 @@ func (h *Handler) handleStatus(w http.ResponseWriter, r *http.Request) {
 	}
 
 	resp := map[string]any{
-		"version":     "0.1.0",
+		"version":     version.Version,
 		"workDir":     h.WorkDir,
 		"settings":    settings,
 		"services":    locals,

internal/version/version.go

@@ -0,0 +1,12 @@
+// Package version holds the single source of truth for the build version.
+//
+// Value is overridable at build time so release artifacts carry the real tag:
+//
+//	go build -ldflags="-X webui4frpc/internal/version.Version=0.1.1" ./cmd/webui4frpc
+//
+// Kept in its own package because both cmd/ and internal/httpapi report it
+// (main can't be imported, and httpapi must not depend on cmd).
+package version
+
+// Version is the running build's semantic version, without a leading "v".
+var Version = "0.1.1"