feat: ToNav-go v1.0.0 - 内部服务导航系统

功能:
- 前台导航: 分类Tab切换、实时搜索、健康状态指示、响应式适配
- 后台管理: 服务/分类CRUD、系统设置、登录认证(bcrypt)
- 健康检查: 定时检测(5min)、独立检查URL、三态指示(在线/离线/未检测)
- 云端备份: WebDAV上传/下载/恢复/删除、定时自动备份、本地备份管理

技术栈: Go + Gin + GORM + SQLite

handlers/api.go

@@ -0,0 +1,157 @@
+package handlers
+
+import (
+	"net/http"
+	"strconv"
+	"tonav-go/database"
+	"tonav-go/models"
+
+	"github.com/gin-gonic/gin"
+)
+
+// API 响应结构
+type Response struct {
+	Success bool        `json:"success"`
+	Message string      `json:"message"`
+	Data    interface{} `json:"data,omitempty"`
+}
+
+// GetServices 获取所有服务
+func GetServices(c *gin.Context) {
+	var services []models.Service
+	database.DB.Order("category_id asc, sort_order desc").Find(&services)
+	c.JSON(http.StatusOK, Response{Success: true, Data: services})
+}
+
+// SaveService 创建或更新服务
+func SaveService(c *gin.Context) {
+	var service models.Service
+	if err := c.ShouldBindJSON(&service); err != nil {
+		c.JSON(http.StatusBadRequest, Response{Success: false, Message: "请求数据格式错误: " + err.Error()})
+		return
+	}
+
+	// 验证必填字段
+	if service.Name == "" {
+		c.JSON(http.StatusBadRequest, Response{Success: false, Message: "服务名称不能为空"})
+		return
+	}
+	if service.URL == "" {
+		c.JSON(http.StatusBadRequest, Response{Success: false, Message: "服务地址不能为空"})
+		return
+	}
+
+	// 如果 URL 路径中有 id，使用路径参数
+	if idStr := c.Param("id"); idStr != "" {
+		id, err := strconv.ParseUint(idStr, 10, 32)
+		if err == nil {
+			service.ID = uint(id)
+		}
+	}
+
+	if service.ID > 0 {
+		// 更新时只更新指定字段，避免覆盖 created_at 等
+		result := database.DB.Model(&models.Service{}).Where("id = ?", service.ID).Updates(map[string]interface{}{
+			"name":                 service.Name,
+			"url":                  service.URL,
+			"description":         service.Description,
+			"icon":                service.Icon,
+			"category_id":         service.CategoryID,
+			"tags":                service.Tags,
+			"is_enabled":          service.IsEnabled,
+			"sort_order":          service.SortOrder,
+			"health_check_url":    service.HealthCheckURL,
+			"health_check_enabled": service.HealthCheckEnabled,
+		})
+		if result.Error != nil {
+			c.JSON(http.StatusInternalServerError, Response{Success: false, Message: "更新失败: " + result.Error.Error()})
+			return
+		}
+	} else {
+		if err := database.DB.Create(&service).Error; err != nil {
+			c.JSON(http.StatusInternalServerError, Response{Success: false, Message: "创建失败: " + err.Error()})
+			return
+		}
+	}
+
+	c.JSON(http.StatusOK, Response{Success: true, Message: "保存成功", Data: service})
+}
+
+// DeleteService 删除服务
+func DeleteService(c *gin.Context) {
+	id := c.Param("id")
+	if id == "" {
+		c.JSON(http.StatusBadRequest, Response{Success: false, Message: "缺少服务ID"})
+		return
+	}
+	if err := database.DB.Delete(&models.Service{}, id).Error; err != nil {
+		c.JSON(http.StatusInternalServerError, Response{Success: false, Message: "删除失败"})
+		return
+	}
+	c.JSON(http.StatusOK, Response{Success: true, Message: "删除成功"})
+}
+
+// GetCategories 获取所有分类
+func GetCategories(c *gin.Context) {
+	var categories []models.Category
+	database.DB.Order("sort_order desc").Find(&categories)
+	c.JSON(http.StatusOK, Response{Success: true, Data: categories})
+}
+
+// SaveCategory 保存分类
+func SaveCategory(c *gin.Context) {
+	var category models.Category
+	if err := c.ShouldBindJSON(&category); err != nil {
+		c.JSON(http.StatusBadRequest, Response{Success: false, Message: "请求数据格式错误: " + err.Error()})
+		return
+	}
+
+	if category.Name == "" {
+		c.JSON(http.StatusBadRequest, Response{Success: false, Message: "分类名称不能为空"})
+		return
+	}
+
+	// 如果 URL 路径中有 id
+	if idStr := c.Param("id"); idStr != "" {
+		id, err := strconv.ParseUint(idStr, 10, 32)
+		if err == nil {
+			category.ID = uint(id)
+		}
+	}
+
+	if category.ID > 0 {
+		result := database.DB.Model(&models.Category{}).Where("id = ?", category.ID).Updates(map[string]interface{}{
+			"name":       category.Name,
+			"sort_order": category.SortOrder,
+		})
+		if result.Error != nil {
+			c.JSON(http.StatusInternalServerError, Response{Success: false, Message: "更新失败: " + result.Error.Error()})
+			return
+		}
+	} else {
+		if err := database.DB.Create(&category).Error; err != nil {
+			c.JSON(http.StatusInternalServerError, Response{Success: false, Message: "创建失败: " + err.Error()})
+			return
+		}
+	}
+	c.JSON(http.StatusOK, Response{Success: true, Message: "保存成功", Data: category})
+}
+
+// DeleteCategory 删除分类
+func DeleteCategory(c *gin.Context) {
+	id := c.Param("id")
+	if id == "" {
+		c.JSON(http.StatusBadRequest, Response{Success: false, Message: "缺少分类ID"})
+		return
+	}
+	// 检查是否有服务属于该分类
+	var count int64
+	database.DB.Model(&models.Service{}).Where("category_id = ?", id).Count(&count)
+	if count > 0 {
+		c.JSON(http.StatusBadRequest, Response{Success: false, Message: "该分类下仍有服务，无法删除"})
+		return
+	}
+
+	database.DB.Delete(&models.Category{}, id)
+	c.JSON(http.StatusOK, Response{Success: true, Message: "删除成功"})
+}