feat: Add Swagger documentation for admin and master API endpoints

- Added Swagger documentation for the following admin endpoints:
  - Create a new master tenant
  - Create a new provider
  - Register a new model
  - List all models
  - Update a model
  - Force sync snapshot
  - Ingest logs

- Added Swagger documentation for the master endpoint:
  - Issue a child key

- Updated go.mod and go.sum to include necessary dependencies for Swagger.

cmd/server/main.go

@@ -9,6 +9,7 @@ import (
 	"syscall"
 	"time"
 
+	_ "github.com/ez-api/ez-api/docs"
 	"github.com/ez-api/ez-api/internal/api"
 	"github.com/ez-api/ez-api/internal/config"
 	"github.com/ez-api/ez-api/internal/middleware"
@@ -16,10 +17,35 @@ import (
 	"github.com/ez-api/ez-api/internal/service"
 	"github.com/gin-gonic/gin"
 	"github.com/redis/go-redis/v9"
+	swaggerFiles "github.com/swaggo/files"
+	ginSwagger "github.com/swaggo/gin-swagger"
 	"gorm.io/driver/postgres"
 	"gorm.io/gorm"
 )
 
+// @title           EZ-API Control Plane
+// @version         0.0.1
+// @description     Management API for EZ-API Gateway system.
+// @termsOfService  http://swagger.io/terms/
+
+// @contact.name    API Support
+// @contact.url     http://www.swagger.io/support
+// @contact.email   support@swagger.io
+
+// @license.name    Apache 2.0
+// @license.url     http://www.apache.org/licenses/LICENSE-2.0.html
+
+// @host            localhost:8080
+// @BasePath        /
+
+// @securityDefinitions.apikey AdminAuth
+// @in header
+// @name Authorization
+
+// @securityDefinitions.apikey MasterAuth
+// @in header
+// @name Authorization
+
 func main() {
 	// 1. Load Configuration
 	cfg, err := config.Load()
@@ -113,6 +139,9 @@ func main() {
 		c.JSON(httpStatus, status)
 	})
 
+	// Swagger Documentation
+	r.GET("/swagger/*any", ginSwagger.WrapHandler(swaggerFiles.Handler))
+
 	// API Routes
 	// Admin Routes
 	adminGroup := r.Group("/admin")