feat: RRBEC Local Server - Go backend with Django sync

- Implement local-first architecture with SQLite
- Add bidirectional sync with Django via ChangeLog
- JWT authentication with auto-refresh token
- REST API for products, orders, commands, payments
- Stock management with automatic deduction

rrbec_server/cmd/server/main.go

@@ -0,0 +1,78 @@
+package main
+
+import (
+	"log"
+	"rrbec_server/internal/api"
+	"rrbec_server/internal/config"
+	"rrbec_server/internal/database"
+	"rrbec_server/internal/repository"
+	"rrbec_server/internal/service"
+	"rrbec_server/internal/sync"
+
+	"github.com/gin-gonic/gin"
+)
+
+func main() {
+	// 1. Load Configuration
+	config.LoadConfig()
+
+	// 2. Initialize Database
+	db := database.InitDB(config.AppConfig.DBName)
+
+	// 3. Initialize Dependency Injection
+	repo := repository.NewRepository(db)
+	svc := service.NewService(repo)
+	handler := api.NewHandler(svc)
+
+	// 4. Start Sync Worker
+	syncer := sync.NewSyncer(repo, config.AppConfig.DjangoBaseURL, config.AppConfig.DjangoMasterUser, config.AppConfig.DjangoMasterPassword)
+	syncer.Start()
+
+	// 4. Setup Gin Router
+	r := gin.Default()
+
+	// API Routes
+	v1 := r.Group("/api/v1")
+	{
+		// Public routes
+		v1.POST("/login", handler.Login)
+		v1.GET("/products", handler.GetProducts)
+		v1.GET("/mesas", handler.GetMesas)
+		v1.GET("/comandas", handler.GetComandas)
+		v1.GET("/comandas/:id", handler.GetComandaByID)
+		v1.GET("/categories", handler.GetCategories)
+		v1.GET("/payment-types", handler.GetTypePayments)
+		v1.GET("/clients", handler.GetClients)
+		v1.GET("/orders", handler.GetOrders)
+		v1.GET("/payments", handler.GetPayments)
+
+		// Protected routes
+		protected := v1.Group("/")
+		protected.Use(api.SimpleAuthMiddleware())
+		{
+			protected.POST("/products", handler.CreateProduct)
+			protected.PATCH("/products/:id", handler.UpdateProduct)
+			protected.POST("/categories", handler.CreateCategory)
+			protected.PATCH("/categories/:id", handler.UpdateCategory)
+			protected.POST("/comandas", handler.CreateComanda)
+			protected.POST("/items-comanda", handler.AddItemToComanda)
+			protected.DELETE("/items-comanda/:id", handler.DeleteItemFromComanda)
+			protected.POST("/comandas/:id/apagar", handler.ClearComanda)
+			protected.POST("/comandas/:id/pagar", handler.PagarComanda)
+			protected.PATCH("/comandas/:id", handler.UpdateComanda)
+			protected.POST("/orders", handler.CreateOrder)
+			protected.PATCH("/orders/:id", handler.UpdateOrder)
+			protected.POST("/orders/:id/preparing", handler.SetOrderPreparing)
+			protected.POST("/orders/:id/finish", handler.SetOrderFinished)
+			protected.POST("/orders/:id/deliver", handler.SetOrderDelivered)
+			protected.POST("/orders/:id/cancel", handler.SetOrderCanceled)
+			protected.GET("/me", handler.GetCurrentUser)
+		}
+	}
+
+	// 6. Run Server
+	log.Printf("Local server running on http://localhost:%s", config.AppConfig.Port)
+	if err := r.Run(":" + config.AppConfig.Port); err != nil {
+		log.Fatalf("failed to run server: %v", err)
+	}
+}