feat: 新增语音转文字（ASR）功能

- 后端：新增 /api/audio/transcribe 接口，调用 Ollama whisper 进行语音识别
- 前端：新增 AudioTranscribePage.vue 页面，支持 MP3/WAV/M4A/OGG/FLAC 等格式
- 注册路由、工具卡片、智能助手欢迎语更新

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

eai_agentplatform/backend-go/internal/api/points.go

@@ -0,0 +1,90 @@
+package api
+
+import (
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
+
+	"eai_agentplatform/backend/internal/middleware"
+	"eai_agentplatform/backend/internal/model"
+	"eai_agentplatform/backend/internal/store"
+	"eai_agentplatform/backend/internal/web"
+)
+
+// —— 积分规则（游戏化成长值，集中一处便于调整，见 docs/changelog.md 待确认项）——
+const (
+	ptFirstCompany    = 10 // 首次浏览公司介绍
+	ptFirstProduct    = 2  // 首次浏览单个产品
+	ptFirstCourse     = 5  // 首次浏览单门课程
+	ptSelfTestSubmit  = 5  // 自测提交一次
+	ptFormalPass      = 50 // 正式考试通过
+	ptMistakeResolved = 3  // 错题标记已掌握
+)
+
+// awardPoints 记录积分流水并累加到 user.learning_points（points<=0 直接忽略，避免负分刷分）。
+func awardPoints(userID uint, eventType string, points int, refType string, refID uint) {
+	if userID == 0 || points <= 0 {
+		return
+	}
+	store.DB.Create(&model.PointEvent{
+		UserID:    userID,
+		EventType: eventType,
+		Points:    points,
+		RefType:   refType,
+		RefID:     refID,
+	})
+	store.DB.Model(&model.User{}).Where("id = ?", userID).
+		UpdateColumn("learning_points", gorm.Expr("learning_points + ?", points))
+}
+
+// awardFirstView 首次浏览公司/产品/课程加分（由 RecordLearningProgress 幂等触发）。
+func awardFirstView(userID uint, itemType string, itemID uint) {
+	switch itemType {
+	case "company":
+		awardPoints(userID, "first_company", ptFirstCompany, itemType, itemID)
+	case "product":
+		awardPoints(userID, "first_product", ptFirstProduct, itemType, itemID)
+	case "course":
+		awardPoints(userID, "first_course", ptFirstCourse, itemType, itemID)
+	}
+}
+
+// MyPoints GET /api/points/me —— 我的积分 + 最近积分流水
+func MyPoints(c *gin.Context) {
+	u := middleware.CurrentUser(c)
+	if u == nil {
+		web.Fail(c, web.NewAuthError("未登录"))
+		return
+	}
+	var total int
+	store.DB.Raw(`SELECT COALESCE(SUM(points), 0) FROM point_event WHERE user_id = ?`, u.ID).Scan(&total)
+	var events []model.PointEvent
+	store.DB.Where("user_id = ?", u.ID).Order("created_at DESC, id DESC").Limit(50).Find(&events)
+	web.OK(c, gin.H{"total": total, "events": events})
+}
+
+// Leaderboard GET /api/points/leaderboard —— 学习积分排行榜（全员，含我的名次）
+func Leaderboard(c *gin.Context) {
+	u := middleware.CurrentUser(c)
+	var users []model.User
+	store.DB.Where("role = ? AND status = ?", "employee", "active").
+		Order("learning_points DESC, id ASC").Find(&users)
+
+	out := make([]gin.H, 0, len(users))
+	myRank := 0
+	for i, usr := range users {
+		out = append(out, gin.H{
+			"rank":            i + 1,
+			"user_id":         usr.ID,
+			"full_name":       usr.FullName,
+			"department":      usr.Department,
+			"learning_points": usr.LearningPoints,
+			"is_me":           u != nil && usr.ID == u.ID,
+		})
+		if u != nil && usr.ID == u.ID {
+			myRank = i + 1
+		}
+	}
+	web.OK(c, gin.H{"items": out, "my_rank": myRank, "total": len(out), "updated_at": time.Now()})
+}