feat: implement web mode for process detail fetching and management, enhance server routing for SPA

server.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"io/fs"
 	"net/http"
 	"os"
 	"os/signal"
@@ -19,6 +20,14 @@ func runServer(port int) {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
+	// Serve embedded frontend/dist at /
+	distFS, err := fs.Sub(assets, "frontend/dist")
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "failed to load embedded assets: %v\n", err)
+		os.Exit(1)
+	}
+	fileServer := http.FileServer(http.FS(distFS))
+
 	streamSys := backend.NewSysInfoHeadless(ctx)
 
 	mux := http.NewServeMux()
@@ -148,6 +157,19 @@ func runServer(port int) {
 	fmt.Printf("  GET  /api/man/<name>           — manual page for a command\n")
 	fmt.Println("\nPress Ctrl+C to stop.")
 
+	// Fallback: serve index.html for any non-API, non-file route (SPA)
+	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		// Try to serve the exact file from dist; if it doesn't exist, serve index.html
+		_, err := distFS.Open(strings.TrimPrefix(r.URL.Path, "/"))
+		if err != nil || r.URL.Path == "/" {
+			r2 := r.Clone(r.Context())
+			r2.URL.Path = "/"
+			fileServer.ServeHTTP(w, r2)
+			return
+		}
+		fileServer.ServeHTTP(w, r)
+	})
+
 	srv := &http.Server{
 		Addr:         addr,
 		Handler:      mux,