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/jwt_service.go

@@ -5,34 +5,42 @@ import (
 	"with_you/internal/pkg/jwt"
 )
 
-// JWTService JWT服务
-type JWTService struct {
+// JWTService JWT服务接口
+type JWTService interface {
+	GenerateAccessToken(userID, username string) (string, error)
+	GenerateRefreshToken(userID, username string) (string, error)
+	ParseToken(tokenString string) (*jwt.Claims, error)
+	ValidateToken(tokenString string) error
+}
+
+// jwtServiceImpl JWT服务实现
+type jwtServiceImpl struct {
 	jwt *jwt.JWT
 }
 
 // NewJWTService 创建JWT服务
-func NewJWTService(secret string, accessExpire, refreshExpire int64) *JWTService {
-	return &JWTService{
+func NewJWTService(secret string, accessExpire, refreshExpire int64) JWTService {
+	return &jwtServiceImpl{
 		jwt: jwt.New(secret, time.Duration(accessExpire)*time.Second, time.Duration(refreshExpire)*time.Second),
 	}
 }
 
 // GenerateAccessToken 生成访问令牌
-func (s *JWTService) GenerateAccessToken(userID, username string) (string, error) {
+func (s *jwtServiceImpl) GenerateAccessToken(userID, username string) (string, error) {
 	return s.jwt.GenerateAccessToken(userID, username)
 }
 
 // GenerateRefreshToken 生成刷新令牌
-func (s *JWTService) GenerateRefreshToken(userID, username string) (string, error) {
+func (s *jwtServiceImpl) GenerateRefreshToken(userID, username string) (string, error) {
 	return s.jwt.GenerateRefreshToken(userID, username)
 }
 
 // ParseToken 解析令牌
-func (s *JWTService) ParseToken(tokenString string) (*jwt.Claims, error) {
+func (s *jwtServiceImpl) ParseToken(tokenString string) (*jwt.Claims, error) {
 	return s.jwt.ParseToken(tokenString)
 }
 
 // ValidateToken 验证令牌
-func (s *JWTService) ValidateToken(tokenString string) error {
+func (s *jwtServiceImpl) ValidateToken(tokenString string) error {
 	return s.jwt.ValidateToken(tokenString)
 }