feat(web): add static file serving and update API routes

- Implement embedded static file serving for frontend assets
- Update API routes to use '/api' prefix
- Add web handler for static file serving with proper content types
- Modify .gitignore and README to reflect new web/dist directory structure

web/handler.go

@@ -0,0 +1,93 @@
+package web
+
+import (
+	"io/fs"
+	"net/http"
+	"path"
+	"strings"
+)
+
+var staticFS http.FileSystem
+
+func init() {
+	subFS, err := fs.Sub(StaticFiles, "dist")
+	if err != nil {
+		panic(err)
+	}
+	staticFS = http.FS(subFS)
+}
+
+func ServeStatic(w http.ResponseWriter, r *http.Request) {
+	urlPath := r.URL.Path
+
+	if urlPath == "/" || urlPath == "/index.html" || strings.HasPrefix(urlPath, "/assets/") {
+		if urlPath == "/" {
+			urlPath = "/index.html"
+		}
+
+		filePath := strings.TrimPrefix(urlPath, "/")
+		f, err := staticFS.Open(filePath)
+		if err != nil {
+			serveIndexHTML(w)
+			return
+		}
+		defer f.Close()
+
+		stat, err := f.Stat()
+		if err != nil {
+			serveIndexHTML(w)
+			return
+		}
+
+		if stat.IsDir() {
+			serveIndexHTML(w)
+			return
+		}
+
+		setContentType(w, path.Ext(filePath))
+		http.ServeContent(w, r, filePath, stat.ModTime(), f.(http.File))
+		return
+	}
+
+	serveIndexHTML(w)
+}
+
+func serveIndexHTML(w http.ResponseWriter) {
+	w.Header().Set("Content-Type", "text/html; charset=utf-8")
+	w.Header().Set("Cache-Control", "no-cache")
+	data, _ := StaticFiles.ReadFile("dist/index.html")
+	w.Write(data)
+}
+
+func setContentType(w http.ResponseWriter, ext string) {
+	switch ext {
+	case ".html":
+		w.Header().Set("Content-Type", "text/html; charset=utf-8")
+	case ".css":
+		w.Header().Set("Content-Type", "text/css; charset=utf-8")
+	case ".js":
+		w.Header().Set("Content-Type", "application/javascript; charset=utf-8")
+	case ".json":
+		w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	case ".png":
+		w.Header().Set("Content-Type", "image/png")
+	case ".jpg", ".jpeg":
+		w.Header().Set("Content-Type", "image/jpeg")
+	case ".gif":
+		w.Header().Set("Content-Type", "image/gif")
+	case ".svg":
+		w.Header().Set("Content-Type", "image/svg+xml")
+	case ".ico":
+		w.Header().Set("Content-Type", "image/x-icon")
+	case ".woff":
+		w.Header().Set("Content-Type", "font/woff")
+	case ".woff2":
+		w.Header().Set("Content-Type", "font/woff2")
+	case ".ttf":
+		w.Header().Set("Content-Type", "font/ttf")
+	case ".eot":
+		w.Header().Set("Content-Type", "application/vnd.ms-fontobject")
+	default:
+		w.Header().Set("Content-Type", "application/octet-stream")
+	}
+}