feat: embed frontend in Go binary

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

main.go

@@ -1,10 +1,14 @@
 package main
 
 import (
+	"embed"
 	"flag"
 	"fmt"
+	"io/fs"
 	"log"
+	"net/http"
 	"os"
+	"strings"
 
 	"github.com/gin-gonic/gin"
 	"golang.org/x/crypto/bcrypt"
@@ -15,6 +19,9 @@ import (
 	"gitm/internal/sync"
 )
 
+//go:embed all:web/dist
+var webFS embed.FS
+
 var (
 	flagAddr    = flag.String("addr", "", "Listen address")
 	flagDataDir = flag.String("data", "", "Data directory")
@@ -90,6 +97,23 @@ func runInitMode() {
 func runServer(cfg *config.Config, engine *sync.Engine) error {
 	gin.SetMode(gin.ReleaseMode)
 	r := gin.Default()
+
+	// Serve embedded frontend
+	distFS, err := fs.Sub(webFS, "web/dist")
+	if err == nil {
+		// Serve assets
+		r.StaticFS("/assets", http.FS(distFS))
+		// SPA fallback - serve index.html for non-API routes
+		r.NoRoute(func(c *gin.Context) {
+			if !strings.HasPrefix(c.Request.URL.Path, "/api") {
+				data, _ := webFS.ReadFile("web/dist/index.html")
+				c.Data(http.StatusOK, "text/html; charset=utf-8", data)
+			} else {
+				c.JSON(http.StatusNotFound, gin.H{"error": "Not found"})
+			}
+		})
+	}
+
 	api := r.Group("/api")
 	{
 		api.POST("/login", handler.HandleLogin)