init: 数字员工平台初始代码

包含前端（Vue3 + VueFlow 画布）、后端（Go）、文档体系。
- 工作台画布：节点拖放、连线模式、右键菜单、AI 助手
- 后端：连接器 API、专员种子数据
- 导航：左侧导航、工坊、市场、控制台

eai_ap_app/backend-go/internal/api/notification.go

@@ -0,0 +1,88 @@
+package api
+
+import (
+	"github.com/gin-gonic/gin"
+
+	"eaisalestrain/backend/internal/middleware"
+	"eaisalestrain/backend/internal/model"
+	"eaisalestrain/backend/internal/store"
+	"eaisalestrain/backend/internal/web"
+)
+
+// notifyUser 给单个用户发站内通知（userID=0 忽略）。
+func notifyUser(userID uint, ntype, title, content, link string) {
+	if userID == 0 {
+		return
+	}
+	store.DB.Create(&model.Notification{
+		UserID: userID, Type: ntype, Title: title, Content: content, Link: link,
+	})
+}
+
+// notifyAllEmployees 给所有启用员工发通知（如新正式考试发布）。
+func notifyAllEmployees(ntype, title, content, link string) {
+	var users []model.User
+	store.DB.Where("role = ? AND status = ?", "employee", "active").Select("id").Find(&users)
+	for _, u := range users {
+		notifyUser(u.ID, ntype, title, content, link)
+	}
+}
+
+// MyNotifications GET /api/notifications?unread_only=true —— 我的通知列表
+func MyNotifications(c *gin.Context) {
+	u := middleware.CurrentUser(c)
+	if u == nil {
+		web.Fail(c, web.NewAuthError("未登录"))
+		return
+	}
+	q := store.DB.Model(&model.Notification{}).Where("user_id = ?", u.ID)
+	if c.Query("unread_only") == "true" {
+		q = q.Where("read = ?", false)
+	}
+	var items []model.Notification
+	q.Order("created_at DESC, id DESC").Limit(100).Find(&items)
+	web.OK(c, items)
+}
+
+// UnreadNotificationCount GET /api/notifications/unread-count —— 未读数（铃铛角标）
+func UnreadNotificationCount(c *gin.Context) {
+	u := middleware.CurrentUser(c)
+	if u == nil {
+		web.Fail(c, web.NewAuthError("未登录"))
+		return
+	}
+	var n int64
+	store.DB.Model(&model.Notification{}).Where("user_id = ? AND read = ?", u.ID, false).Count(&n)
+	web.OK(c, gin.H{"unread": n})
+}
+
+// MarkNotificationRead PUT /api/notifications/{id}/read —— 标记单条已读
+func MarkNotificationRead(c *gin.Context) {
+	u := middleware.CurrentUser(c)
+	id, ok := parseID(c, "id")
+	if !ok {
+		return
+	}
+	var n model.Notification
+	if err := store.DB.First(&n, id).Error; err != nil {
+		web.Fail(c, web.NewNotFoundError("通知不存在"))
+		return
+	}
+	if n.UserID != u.ID {
+		web.Fail(c, web.NewForbiddenError("无权操作他人通知"))
+		return
+	}
+	store.DB.Model(&n).Update("read", true)
+	web.OK(c, gin.H{"id": n.ID, "read": true})
+}
+
+// MarkAllNotificationsRead PUT /api/notifications/read-all —— 全部标记已读
+func MarkAllNotificationsRead(c *gin.Context) {
+	u := middleware.CurrentUser(c)
+	if u == nil {
+		web.Fail(c, web.NewAuthError("未登录"))
+		return
+	}
+	store.DB.Model(&model.Notification{}).Where("user_id = ? AND read = ?", u.ID, false).Update("read", true)
+	web.OK(c, gin.H{"read": true})
+}