fix: 补全 ShopProfile 和 Post 响应中缺失的后端字段

ShopProfile 补上 allowMultiShop/allowIndependentOrders/dispatchMode，Post 补上 pinned/linkedOrderId。这些字段在 RPC proto、数据库和写入逻辑中均已存在，但 API 响应类型和映射函数遗漏了它们。同时补回 community.api 中 CreateCommentReq 的 PostId 字段定义。

app/community/api/internal/logic/community/helpers.go

@@ -44,16 +44,18 @@ func buildUserProfile(ctx context.Context, svcCtx *svc.ServiceContext, userID in
 
 func mapPost(ctx context.Context, svcCtx *svc.ServiceContext, p *communitypb.Posts, liked bool) types.Post {
 	return types.Post{
-		Id:           p.GetId(),
-		Title:        p.GetTitle(),
-		Content:      p.GetContent(),
-		Images:       append([]string(nil), p.GetImages()...),
-		Tags:         append([]string(nil), p.GetTags()...),
-		LikeCount:    p.GetLikeCount(),
-		CommentCount: p.GetCommentCount(),
-		Liked:        liked,
-		Author:       buildUserProfile(ctx, svcCtx, p.GetAuthorId()),
-		CreatedAt:    time.Unix(p.GetCreatedAt(), 0).UTC().Format(time.RFC3339),
+		Id:            p.GetId(),
+		Title:         p.GetTitle(),
+		Content:       p.GetContent(),
+		Images:        append([]string(nil), p.GetImages()...),
+		Tags:          append([]string(nil), p.GetTags()...),
+		LinkedOrderId: p.GetLinkedOrderId(),
+		Pinned:        p.GetPinned(),
+		LikeCount:     p.GetLikeCount(),
+		CommentCount:  p.GetCommentCount(),
+		Liked:         liked,
+		Author:        buildUserProfile(ctx, svcCtx, p.GetAuthorId()),
+		CreatedAt:     time.Unix(p.GetCreatedAt(), 0).UTC().Format(time.RFC3339),
 	}
 }