feat: add main application entry point

- Add main.go with Fiber web server setup
- Include database initialization and admin user setup
- Add middleware configuration (logging, request ID, health check)
- Add Swagger documentation integration
- Configure server to listen on port 8000
- Include proper error handling and graceful shutdown

main.go

@@ -0,0 +1,46 @@
+package main
+
+import (
+	"git.secnex.io/secnex/idp-api/db"
+	"git.secnex.io/secnex/idp-api/middlewares"
+	"git.secnex.io/secnex/idp-api/routes"
+	"git.secnex.io/secnex/idp-api/utils"
+	"github.com/gofiber/contrib/swagger"
+	"github.com/gofiber/fiber/v2"
+	"github.com/gofiber/fiber/v2/log"
+	"github.com/gofiber/fiber/v2/middleware/healthcheck"
+	"github.com/gofiber/fiber/v2/middleware/logger"
+	"github.com/gofiber/fiber/v2/middleware/requestid"
+)
+
+func main() {
+	if err := db.InitializeDB(); err != nil {
+		log.Fatalf("Failed to initialize database: %v", err)
+	}
+	defer db.CloseDB()
+
+	utils.CheckAdminUser()
+
+	app := fiber.New()
+
+	swaggerCfg := swagger.Config{
+		BasePath: "/",
+		FilePath: "./docs/swagger.json",
+		Path:     "/docs/swagger",
+		Title:    "Swagger API Docs",
+	}
+
+	app.Use(
+		logger.New(),
+		requestid.New(),
+		healthcheck.New(),
+		swagger.New(swaggerCfg),
+		middlewares.DatabaseMiddleware(), // Add database middleware
+	)
+
+	routes.SetupRoutes(app)
+
+	if err := app.Listen(":8000"); err != nil {
+		log.Fatalf("Failed to start server: %v", err)
+	}
+}