docs(readme): 重写项目文档，更新技术栈与功能说明

feat(character): 新增人设详情接口并优化获取逻辑

src/main/java/com/yolo/keyborad/controller/CharacterController.java

@@ -49,8 +49,7 @@ public class CharacterController {
     @GetMapping("/detail")
     @Operation(summary = "人设详情", description = "人设详情接口")
     public BaseResponse<KeyboardCharacterRespVO> detail(@RequestParam("id") Long id) {
-        KeyboardCharacter character = characterService.getById(id);
-        return ResultUtils.success(BeanUtil.copyProperties(character, KeyboardCharacterRespVO.class));
+        return ResultUtils.success(characterService.getDetailById(id));
     }
 
     @GetMapping("/listByTag")