refactor: improve system stability, performance, and code structure

This commit introduces several architectural improvements and optimizations across the codebase:

- **Performance & Reliability**:
  - Implemented Redis pipelining in `ConversationCache.CacheMessage` to reduce network round-trips.
  - Added a circuit breaker to the JPush client to prevent cascading failures.
  - Introduced batch deletion and batch member addition capabilities in repositories.
  - Added message idempotency support using `client_msg_id` and a Redis-based cache.
  - Optimized WebSocket handling with connection limits (total and per-user) and improved error logging.

- **Code Refactoring**:
  - Refactored `Router` to use a `RouterDeps` struct, simplifying the constructor and improving maintainability.
  - Unified model ID generation logic using new `id_helper.go` (supporting UUID and Snowflake).
  - Standardized JSON serialization/deserialization in models using `json_helper.go`.
  - Refactored DTO conversion logic, specifically for `UserResponse` (using functional options) and `Report` responses.
  - Removed redundant/deprecated DTOs like `PostDetailResponse` and `TradeItemDetailResponse`.

- **Cache Improvements**:
  - Enhanced `LayeredCache` with `SetRaw` to avoid double-encoding when promoting values from Redis to local cache.
  - Added `DeleteBatch` support to the cache interface.

- **Other Changes**:
  - Cleaned up `config.go` by removing redundant default values and explicit environment variable overrides.
  - Improved WebSocket registration flow to handle connection limits gracefully.

internal/dto/user_converter.go

@@ -5,7 +5,20 @@ import (
 	"with_you/internal/pkg/utils"
 )
 
-// ==================== User 转换 ====================
+type UserResponseOption func(*UserResponse)
+
+func WithFollowing(isFollowing, isFollowingMe bool) UserResponseOption {
+	return func(r *UserResponse) {
+		r.IsFollowing = isFollowing
+		r.IsFollowingMe = isFollowingMe
+	}
+}
+
+func WithPostsCount(count int) UserResponseOption {
+	return func(r *UserResponse) {
+		r.PostsCount = count
+	}
+}
 
 // getAvatarOrDefault 获取头像URL，如果为空则返回在线头像生成服务的URL
 func getAvatarOrDefault(user *model.User) string {
@@ -22,8 +35,7 @@ func publicVerificationFields(user *model.User) (model.UserIdentity, model.Verif
 	return model.UserIdentityGeneral, model.VerificationStatusNone
 }
 
-// ConvertUserToResponse 将User转换为UserResponse（公开信息，不包含敏感数据）
-func ConvertUserToResponse(user *model.User) *UserResponse {
+func baseUserResponse(user *model.User) *UserResponse {
 	if user == nil {
 		return nil
 	}
@@ -47,6 +59,18 @@ func ConvertUserToResponse(user *model.User) *UserResponse {
 	}
 }
 
+// ConvertUserToResponse 将User转换为UserResponse（公开信息，不包含敏感数据）
+func ConvertUserToResponse(user *model.User, opts ...UserResponseOption) *UserResponse {
+	r := baseUserResponse(user)
+	if r == nil {
+		return nil
+	}
+	for _, opt := range opts {
+		opt(r)
+	}
+	return r
+}
+
 // ConvertUserToSelfResponse 将User转换为UserSelfResponse（本人信息，包含敏感数据）
 func ConvertUserToSelfResponse(user *model.User, postsCount int) *UserSelfResponse {
 	if user == nil {
@@ -75,151 +99,6 @@ func ConvertUserToSelfResponse(user *model.User, postsCount int) *UserSelfRespon
 	}
 }
 
-func convertPrivacySettingsToResponse(ps *model.PrivacySettings) *PrivacySettingsResponse {
-	if ps == nil {
-		return nil
-	}
-	return &PrivacySettingsResponse{
-		FollowersVisibility: string(ps.FollowersVisibility),
-		FollowingVisibility: string(ps.FollowingVisibility),
-		PostsVisibility:     string(ps.PostsVisibility),
-		FavoritesVisibility: string(ps.FavoritesVisibility),
-	}
-}
-
-// ConvertUserToResponseWithFollowing 将User转换为UserResponse（包含关注状态，公开信息）
-func ConvertUserToResponseWithFollowing(user *model.User, isFollowing bool) *UserResponse {
-	if user == nil {
-		return nil
-	}
-	identity, vs := publicVerificationFields(user)
-	return &UserResponse{
-		ID:                 user.ID,
-		Username:           user.Username,
-		Nickname:           user.Nickname,
-		EmailVerified:      user.EmailVerified,
-		Avatar:             getAvatarOrDefault(user),
-		CoverURL:           user.CoverURL,
-		Bio:                user.Bio,
-		Website:            user.Website,
-		Location:           user.Location,
-		PostsCount:         user.PostsCount,
-		FollowersCount:     user.FollowersCount,
-		FollowingCount:     user.FollowingCount,
-		IsFollowing:        isFollowing,
-		IsFollowingMe:      false,
-		CreatedAt:          FormatTime(user.CreatedAt),
-		Identity:           identity,
-		VerificationStatus: vs,
-	}
-}
-
-// ConvertUserToResponseWithPostsCount 将User转换为UserResponse（使用实时计算的帖子数量，公开信息）
-func ConvertUserToResponseWithPostsCount(user *model.User, postsCount int) *UserResponse {
-	if user == nil {
-		return nil
-	}
-	identity, vs := publicVerificationFields(user)
-	return &UserResponse{
-		ID:                 user.ID,
-		Username:           user.Username,
-		Nickname:           user.Nickname,
-		EmailVerified:      user.EmailVerified,
-		Avatar:             getAvatarOrDefault(user),
-		CoverURL:           user.CoverURL,
-		Bio:                user.Bio,
-		Website:            user.Website,
-		Location:           user.Location,
-		PostsCount:         postsCount,
-		FollowersCount:     user.FollowersCount,
-		FollowingCount:     user.FollowingCount,
-		CreatedAt:          FormatTime(user.CreatedAt),
-		Identity:           identity,
-		VerificationStatus: vs,
-	}
-}
-
-// ConvertUserToResponseWithMutualFollow 将User转换为UserResponse（包含双向关注状态，公开信息）
-func ConvertUserToResponseWithMutualFollow(user *model.User, isFollowing, isFollowingMe bool) *UserResponse {
-	if user == nil {
-		return nil
-	}
-	identity, vs := publicVerificationFields(user)
-	return &UserResponse{
-		ID:                 user.ID,
-		Username:           user.Username,
-		Nickname:           user.Nickname,
-		EmailVerified:      user.EmailVerified,
-		Avatar:             getAvatarOrDefault(user),
-		CoverURL:           user.CoverURL,
-		Bio:                user.Bio,
-		Website:            user.Website,
-		Location:           user.Location,
-		PostsCount:         user.PostsCount,
-		FollowersCount:     user.FollowersCount,
-		FollowingCount:     user.FollowingCount,
-		IsFollowing:        isFollowing,
-		IsFollowingMe:      isFollowingMe,
-		CreatedAt:          FormatTime(user.CreatedAt),
-		Identity:           identity,
-		VerificationStatus: vs,
-	}
-}
-
-// ConvertUserToResponseWithMutualFollowAndPostsCount 将User转换为UserResponse（包含双向关注状态和实时计算的帖子数量，公开信息）
-func ConvertUserToResponseWithMutualFollowAndPostsCount(user *model.User, isFollowing, isFollowingMe bool, postsCount int) *UserResponse {
-	if user == nil {
-		return nil
-	}
-	identity, vs := publicVerificationFields(user)
-	return &UserResponse{
-		ID:                 user.ID,
-		Username:           user.Username,
-		Nickname:           user.Nickname,
-		EmailVerified:      user.EmailVerified,
-		Avatar:             getAvatarOrDefault(user),
-		CoverURL:           user.CoverURL,
-		Bio:                user.Bio,
-		Website:            user.Website,
-		Location:           user.Location,
-		PostsCount:         postsCount,
-		FollowersCount:     user.FollowersCount,
-		FollowingCount:     user.FollowingCount,
-		IsFollowing:        isFollowing,
-		IsFollowingMe:      isFollowingMe,
-		CreatedAt:          FormatTime(user.CreatedAt),
-		Identity:           identity,
-		VerificationStatus: vs,
-	}
-}
-
-// ConvertUserToDetailResponse 将User转换为UserDetailResponse（仅本人可见，包含敏感信息）
-func ConvertUserToDetailResponse(user *model.User) *UserDetailResponse {
-	if user == nil {
-		return nil
-	}
-	return &UserDetailResponse{
-		ID:                 user.ID,
-		Username:           user.Username,
-		Nickname:           user.Nickname,
-		Email:              user.Email,
-		EmailVerified:      user.EmailVerified,
-		Avatar:             getAvatarOrDefault(user),
-		CoverURL:           user.CoverURL,
-		Bio:                user.Bio,
-		Website:            user.Website,
-		Location:           user.Location,
-		PostsCount:         user.PostsCount,
-		FollowersCount:     user.FollowersCount,
-		FollowingCount:     user.FollowingCount,
-		IsVerified:         user.IsVerified,
-		CreatedAt:          FormatTime(user.CreatedAt),
-		PrivacySettings:    convertPrivacySettingsToResponse(&user.PrivacySettings),
-		Identity:           user.Identity,
-		VerificationStatus: user.VerificationStatus,
-	}
-}
-
 // ConvertUserToDetailResponseWithPostsCount 将User转换为UserDetailResponse（使用实时计算的帖子数量，仅本人可见）
 func ConvertUserToDetailResponseWithPostsCount(user *model.User, postsCount int) *UserDetailResponse {
 	if user == nil {
@@ -248,31 +127,28 @@ func ConvertUserToDetailResponseWithPostsCount(user *model.User, postsCount int)
 	}
 }
 
+func convertPrivacySettingsToResponse(ps *model.PrivacySettings) *PrivacySettingsResponse {
+	if ps == nil {
+		return nil
+	}
+	return &PrivacySettingsResponse{
+		FollowersVisibility: string(ps.FollowersVisibility),
+		FollowingVisibility: string(ps.FollowingVisibility),
+		PostsVisibility:     string(ps.PostsVisibility),
+		FavoritesVisibility: string(ps.FavoritesVisibility),
+	}
+}
+
 // ConvertUsersToResponse 将User列表转换为响应列表
-func ConvertUsersToResponse(users []*model.User) []*UserResponse {
+func ConvertUsersToResponse(users []*model.User, opts ...UserResponseOption) []*UserResponse {
 	result := make([]*UserResponse, 0, len(users))
 	for _, user := range users {
-		result = append(result, ConvertUserToResponse(user))
+		result = append(result, ConvertUserToResponse(user, opts...))
 	}
 	return result
 }
 
-// ConvertUsersToResponseWithMutualFollow 将User列表转换为响应列表（包含双向关注状态）
-// followingStatusMap: key是用户ID，value是[isFollowing, isFollowingMe]
-func ConvertUsersToResponseWithMutualFollow(users []*model.User, followingStatusMap map[string][2]bool) []*UserResponse {
-	result := make([]*UserResponse, 0, len(users))
-	for _, user := range users {
-		status, ok := followingStatusMap[user.ID]
-		if ok {
-			result = append(result, ConvertUserToResponseWithMutualFollow(user, status[0], status[1]))
-		} else {
-			result = append(result, ConvertUserToResponse(user))
-		}
-	}
-	return result
-}
-
-// ConvertUsersToResponseWithMutualFollowAndPostsCount 将User列表转换为响应列表（包含双向关注状态和实时计算的帖子数量）
+// ConvertUsersToResponseWithMutualFollowAndPostsCount 将User列表转换为响应列表（包含双向关注状态和帖子数量）
 // followingStatusMap: key是用户ID，value是[isFollowing, isFollowingMe]
 // postsCountMap: key是用户ID，value是帖子数量
 func ConvertUsersToResponseWithMutualFollowAndPostsCount(users []*model.User, followingStatusMap map[string][2]bool, postsCountMap map[string]int64) []*UserResponse {
@@ -280,17 +156,15 @@ func ConvertUsersToResponseWithMutualFollowAndPostsCount(users []*model.User, fo
 	for _, user := range users {
 		status, hasStatus := followingStatusMap[user.ID]
 		postsCount, hasPostsCount := postsCountMap[user.ID]
-
-		// 如果没有帖子数量，使用数据库中的值
 		if !hasPostsCount {
 			postsCount = int64(user.PostsCount)
 		}
-
+		var opts []UserResponseOption
 		if hasStatus {
-			result = append(result, ConvertUserToResponseWithMutualFollowAndPostsCount(user, status[0], status[1], int(postsCount)))
-		} else {
-			result = append(result, ConvertUserToResponseWithPostsCount(user, int(postsCount)))
+			opts = append(opts, WithFollowing(status[0], status[1]))
 		}
+		opts = append(opts, WithPostsCount(int(postsCount)))
+		result = append(result, ConvertUserToResponse(user, opts...))
 	}
 	return result
-}
+}