专题 canonical URL 由 /list?themeId=X 改为 /topic/[slug]/

与 sitemap 输出和前端规范地址保持一致，避免 canonical 指向会被 301 的旧路径。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

app/service/playletthemeser/theme.go

@@ -2,13 +2,13 @@ package playletthemeser
 
 import (
 	"context"
-	"strconv"
 	"strings"
 	"videoweb/app/api/proto"
 	"videoweb/app/service/configser"
 	"videoweb/app/service/playletcache"
 	"videoweb/pub/common/netutil"
 	"videoweb/pub/common/srvdef"
+	"videoweb/pub/common/utils"
 	"videoweb/pub/pubdef"
 )
 
@@ -54,11 +54,18 @@ func buildThemeSeoInfo(item *playletcache.ThemeItem) *proto.SeoInfo {
 	if len(custom.Keyworld) > 0 {
 		seo.Keywords = append([]string{}, custom.Keyworld...)
 	}
-	pagePath := "/list?themeId=" + strconv.FormatInt(item.Id, 10)
-	seo.CanonicalURL = joinCanonicalURL(seo.CanonicalURL, pagePath)
+	seo.CanonicalURL = joinCanonicalURL(seo.CanonicalURL, buildThemeCanonicalPath(item.Slug, item.Id))
 	return &seo
 }
 
+// buildThemeCanonicalPath 专题详情页规范相对路径（对齐 sitemap /topic/[slug]/，前端 /list?themeId=X 会被 301）。
+func buildThemeCanonicalPath(slug string, id int64) string {
+	if segment := utils.PathSegment(slug, id); segment != "" {
+		return "/topic/" + segment + "/"
+	}
+	return "/topic/"
+}
+
 func normalizeThemeSeoValue(seo pubdef.SeoValue) pubdef.SeoValue {
 	seo.Title = strings.TrimSpace(seo.Title)
 	seo.Description = strings.TrimSpace(seo.Description)