feat(admin): 运营后台（登录/查看/审核编辑/补全）+ 写入API + 审计留痕

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

api/internal/adminweb/embed.go

@@ -0,0 +1,21 @@
+// Package adminweb embeds the built admin SPA (Vite dist). During Docker builds
+// the real dist/ is produced by the node stage and copied in before go build;
+// the committed placeholder keeps the package compilable for `go build ./...`.
+package adminweb
+
+import (
+	"embed"
+	"io/fs"
+)
+
+//go:embed all:dist
+var distFS embed.FS
+
+// Dist returns the embedded SPA filesystem rooted at dist/.
+func Dist() fs.FS {
+	sub, err := fs.Sub(distFS, "dist")
+	if err != nil {
+		panic(err)
+	}
+	return sub
+}