feat: add admin dashboard

apps/server/internal/httpserver/app_files.go

@@ -0,0 +1,26 @@
+package httpserver
+
+import (
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+func (s *Server) appFileServer() http.Handler {
+	files := http.FileServer(http.Dir(s.config.Web.DistDir))
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		cleanPath := filepath.Clean(strings.TrimPrefix(r.URL.Path, "/"))
+		if cleanPath == "." {
+			cleanPath = "index.html"
+		}
+
+		target := filepath.Join(s.config.Web.DistDir, cleanPath)
+		if info, err := os.Stat(target); err == nil && !info.IsDir() {
+			files.ServeHTTP(w, r)
+			return
+		}
+
+		http.ServeFile(w, r, filepath.Join(s.config.Web.DistDir, "index.html"))
+	})
+}