refactor(server): decouple services and improve architecture

- Introduce interfaces for all major services (JWT, PostAI, Comment, Message, Notification, QRCodeLogin, Upload, Vote, etc.) to support dependency inversion.
- Move query parameters from `internal/dto` to a new `internal/query` package to separate request payloads from data transfer objects.
- Refactor `internal/router` to use embedded `RouterDeps` for cleaner dependency management.
- Decouple handlers from repositories by injecting services instead of direct repository access, ensuring proper layering.
- Improve database initialization by moving it from `internal/model` to `internal/database`.
- Optimize message decryption by implementing a more efficient `BatchDecrypt` method in `MessageEncryptor` using a worker pool.
- Enhance error handling and security by implementing fail-fast checks for encryption key length during startup.
- Clean up unused code, including the `avatar` package and several unused DTOs.

internal/service/livekit_service.go

@@ -5,7 +5,6 @@ import (
 	"crypto/hmac"
 	"crypto/sha256"
 	"encoding/base64"
-	"encoding/json"
 	"fmt"
 	"time"
 
@@ -126,73 +125,3 @@ func (s *liveKitService) verifyWebhookSignature(body []byte, authHeader string)
 
 	return nil
 }
-
-// WebhookRoomFinished 处理 room_finished 事件的负载
-type WebhookRoomFinished struct {
-	RoomName   string `json:"room_name"`
-	Duration   int64  `json:"duration"`
-	StartedAt  int64  `json:"started_at"`
-	EndedAt    int64  `json:"ended_at"`
-}
-
-// ParseRoomFinished 从 webhook event 中解析 room_finished 数据
-func ParseRoomFinished(event *livekit.WebhookEvent) (*WebhookRoomFinished, error) {
-	if event.Event != "room_finished" {
-		return nil, fmt.Errorf("not a room_finished event: %s", event.Event)
-	}
-
-	room := event.Room
-	if room == nil {
-		return nil, fmt.Errorf("room is nil in webhook event")
-	}
-
-	duration := int64(0)
-	startedAt := int64(0)
-	endedAt := int64(0)
-
-	if room.CreationTime > 0 {
-		startedAt = room.CreationTime
-	}
-
-	endedAt = time.Now().Unix()
-	if startedAt > 0 {
-		duration = endedAt - startedAt
-	}
-
-	return &WebhookRoomFinished{
-		RoomName:  room.Name,
-		Duration:  duration,
-		StartedAt: startedAt,
-		EndedAt:   endedAt,
-	}, nil
-}
-
-// WebhookEventJSON 用于 JSON 序列化的 webhook 事件
-type WebhookEventJSON struct {
-	Event    string               `json:"event"`
-	Room     *WebhookRoomJSON     `json:"room,omitempty"`
-	RoomName string               `json:"room_name,omitempty"`
-}
-
-// WebhookRoomJSON webhook 房间信息 JSON
-type WebhookRoomJSON struct {
-	Sid          string `json:"sid,omitempty"`
-	Name         string `json:"name,omitempty"`
-	CreationTime int64  `json:"creation_time,omitempty"`
-	NumParticipants uint32 `json:"num_participants,omitempty"`
-}
-
-// WebhookEventToJSON 将 webhook event 转为自定义 JSON 结构（避免 protobuf 内部字段）
-func WebhookEventToJSON(event *livekit.WebhookEvent) (*WebhookEventJSON, error) {
-	data, err := protojson.Marshal(event)
-	if err != nil {
-		return nil, err
-	}
-
-	var result WebhookEventJSON
-	if err := json.Unmarshal(data, &result); err != nil {
-		return nil, err
-	}
-
-	return &result, nil
-}