feat: 后端认证和工具模块更新

- main.go: 添加 Swagger 文档、初始化默认管理员
- 认证模块: 完善用户角色管理
- 新增工具模块: tool_handler, tool_repo, tool_service, tool model
- 更新 go.mod 依赖

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

server/internal/repository/tool_repo.go

@@ -0,0 +1,83 @@
+package repository
+
+import (
+	"x-agents/server/internal/model"
+
+	"gorm.io/gorm"
+)
+
+type ToolRepository struct {
+	db *gorm.DB
+}
+
+func NewToolRepository(db *gorm.DB) *ToolRepository {
+	return &ToolRepository{db: db}
+}
+
+// DB 获取数据库连接
+func (r *ToolRepository) DB() *gorm.DB {
+	return r.db
+}
+
+func (r *ToolRepository) Create(tool *model.Tool) error {
+	return r.db.Create(tool).Error
+}
+
+func (r *ToolRepository) FindAll() ([]model.Tool, error) {
+	var tools []model.Tool
+	err := r.db.Order("category, name").Find(&tools).Error
+	return tools, err
+}
+
+func (r *ToolRepository) FindByCategory(category string) ([]model.Tool, error) {
+	var tools []model.Tool
+	err := r.db.Where("category = ?", category).Order("name").Find(&tools).Error
+	return tools, err
+}
+
+func (r *ToolRepository) FindByID(id string) (*model.Tool, error) {
+	var tool model.Tool
+	err := r.db.First(&tool, "id = ?", id).Error
+	if err != nil {
+		return nil, err
+	}
+	return &tool, nil
+}
+
+func (r *ToolRepository) Update(tool *model.Tool) error {
+	return r.db.Save(tool).Error
+}
+
+func (r *ToolRepository) Delete(id string) error {
+	return r.db.Delete(&model.Tool{}, "id = ?", id).Error
+}
+
+func (r *ToolRepository) Count() (int64, error) {
+	var count int64
+	err := r.db.Model(&model.Tool{}).Count(&count).Error
+	return count, err
+}
+
+// UpsertBatch 批量upsert工具
+func (r *ToolRepository) UpsertBatch(tools []model.Tool) error {
+	for _, tool := range tools {
+		var existing model.Tool
+		err := r.db.First(&existing, "name = ?", tool.Name).Error
+		if err == gorm.ErrRecordNotFound {
+			if err := r.db.Create(&tool).Error; err != nil {
+				return err
+			}
+		} else if err != nil {
+			return err
+		} else {
+			existing.Description = tool.Description
+			existing.Category = tool.Category
+			existing.Provider = tool.Provider
+			existing.Status = tool.Status
+			if err := r.db.Save(&existing).Error; err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}