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/handler/material_handler.go

@@ -4,9 +4,9 @@ import (
 	"errors"
 	"strconv"
 
-	"with_you/internal/dto"
 	"with_you/internal/model"
 	"with_you/internal/pkg/response"
+	"with_you/internal/query"
 	"with_you/internal/service"
 
 	"github.com/gin-gonic/gin"
@@ -148,7 +148,7 @@ func (h *MaterialHandler) ListMaterials(c *gin.Context) {
 	fileType := c.Query("file_type")
 	keyword := c.Query("keyword")
 
-	params := dto.MaterialFileQueryParams{
+	params := query.MaterialFileQueryParams{
 		SubjectID: subjectID,
 		FileType:  fileType,
 		Keyword:   keyword,
@@ -329,7 +329,7 @@ func (h *MaterialHandler) AdminListMaterials(c *gin.Context) {
 	status := c.Query("status")
 	keyword := c.Query("keyword")
 
-	params := dto.MaterialFileQueryParams{
+	params := query.MaterialFileQueryParams{
 		SubjectID: subjectID,
 		FileType:  fileType,
 		Status:    status,