更新管理端迁移Mycontent-temp的菜单与布局规范，确保主导航收敛并优化隐藏页面入口。新增相关会议记录与文档，反映团队讨论的最新决策与实施建议。

soul-api/internal/handler/book.go

@@ -5,6 +5,8 @@ import (
 	"net/http"
 	"strconv"
 	"strings"
+	"time"
+	"unicode/utf8"
 
 	"soul-api/internal/database"
 	"soul-api/internal/model"
@@ -109,8 +111,61 @@ func getFreeChapterIDs(db *gorm.DB) map[string]bool {
 	return ids
 }
 
+// checkUserChapterAccess 判断 userId 是否有权读取 chapterID（VIP / 全书购买 / 单章购买）
+// isPremium=true 表示增值版，fullbook 买断不含增值版
+func checkUserChapterAccess(db *gorm.DB, userID, chapterID string, isPremium bool) bool {
+	if userID == "" {
+		return false
+	}
+	// VIP：is_vip=1 且未过期
+	var u model.User
+	if err := db.Select("id", "is_vip", "vip_expire_date", "has_full_book").Where("id = ?", userID).First(&u).Error; err != nil {
+		return false
+	}
+	if u.IsVip != nil && *u.IsVip && u.VipExpireDate != nil && u.VipExpireDate.After(time.Now()) {
+		return true
+	}
+	// 全书买断（不含增值版）
+	if !isPremium && u.HasFullBook != nil && *u.HasFullBook {
+		return true
+	}
+	// 全书订单（兜底）
+	if !isPremium {
+		var cnt int64
+		db.Model(&model.Order{}).Where("user_id = ? AND product_type = 'fullbook' AND status = 'paid'", userID).Count(&cnt)
+		if cnt > 0 {
+			return true
+		}
+	}
+	// 单章购买
+	var cnt int64
+	db.Model(&model.Order{}).Where(
+		"user_id = ? AND product_type = 'section' AND product_id = ? AND status = 'paid'",
+		userID, chapterID,
+	).Count(&cnt)
+	return cnt > 0
+}
+
+// previewContent 取内容的前 20%（最多前 200 个字符），并追加省略提示
+func previewContent(content string) string {
+	total := utf8.RuneCountInString(content)
+	if total == 0 {
+		return ""
+	}
+	limit := total / 5
+	if limit < 100 {
+		limit = 100
+	}
+	if limit > total {
+		limit = total
+	}
+	runes := []rune(content)
+	return string(runes[:limit]) + "\n\n……（购买后阅读完整内容）"
+}
+
 // findChapterAndRespond 按条件查章节并返回统一格式
 // 免费判断优先级：system_config.free_chapters / chapter_config.freeChapters > chapters.is_free/price
+// 付费章节：若请求携带 userId 且有购买权限则返回完整 content，否则返回 previewContent
 func findChapterAndRespond(c *gin.Context, whereFn func(*gorm.DB) *gorm.DB) {
 	var ch model.Chapter
 	db := database.DB()
@@ -122,30 +177,43 @@ func findChapterAndRespond(c *gin.Context, whereFn func(*gorm.DB) *gorm.DB) {
 		c.JSON(http.StatusOK, gin.H{"success": false, "error": err.Error()})
 		return
 	}
+
+	isFreeFromConfig := getFreeChapterIDs(db)[ch.ID]
+	isFree := isFreeFromConfig
+	if !isFree && ch.IsFree != nil && *ch.IsFree {
+		isFree = true
+	}
+	if !isFree && ch.Price != nil && *ch.Price == 0 {
+		isFree = true
+	}
+
+	// 确定返回的 content：免费直接返回，付费须校验购买权限
+	userID := c.Query("userId")
+	isPremium := ch.EditionPremium != nil && *ch.EditionPremium
+	var returnContent string
+	if isFree {
+		returnContent = ch.Content
+	} else if checkUserChapterAccess(db, userID, ch.ID, isPremium) {
+		returnContent = ch.Content
+	} else {
+		returnContent = previewContent(ch.Content)
+	}
+
 	out := gin.H{
 		"success":      true,
 		"data":         ch,
-		"content":      ch.Content,
+		"content":      returnContent,
 		"chapterTitle": ch.ChapterTitle,
 		"partTitle":    ch.PartTitle,
 		"id":           ch.ID,
 		"mid":          ch.MID,
 		"sectionTitle": ch.SectionTitle,
+		"isFree":       isFree,
 	}
-	isFreeFromConfig := getFreeChapterIDs(db)[ch.ID]
 	if isFreeFromConfig {
-		out["isFree"] = true
 		out["price"] = float64(0)
-	} else {
-		if ch.IsFree != nil {
-			out["isFree"] = *ch.IsFree
-		}
-		if ch.Price != nil {
-			out["price"] = *ch.Price
-			if *ch.Price == 0 {
-				out["isFree"] = true
-			}
-		}
+	} else if ch.Price != nil {
+		out["price"] = *ch.Price
 	}
 	c.JSON(http.StatusOK, out)
 }