chore: 代码风格统一和项目文档添加

主要变更：

1. 代码风格统一
   - 统一使用双引号替代单引号
   - 保持项目代码风格一致性
   - 涵盖所有模块、配置、实体和服务文件

2. 项目文档
   - 新增 SECURITY_FIXES_SUMMARY.md - 安全修复总结文档
   - 新增 项目问题评估报告.md - 项目问题评估文档

3. 包含修改的文件类别
   - 配置文件：app, database, jwt, redis, cache, performance
   - 实体文件：所有 TypeORM 实体
   - 模块文件：所有业务模块
   - 公共模块：guards, decorators, interceptors, filters, utils
   - 测试文件：单元测试和 E2E 测试

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/modules/users/dto/user.dto.ts

@@ -1,31 +1,31 @@
-import { IsEmail, IsOptional, IsString, MinLength } from 'class-validator';
-import { ApiProperty } from '@nestjs/swagger';
+import { IsEmail, IsOptional, IsString, MinLength } from "class-validator";
+import { ApiProperty } from "@nestjs/swagger";
 
 export class UpdateUserDto {
-  @ApiProperty({ description: '邮箱', required: false })
-  @IsEmail({}, { message: '邮箱格式不正确' })
+  @ApiProperty({ description: "邮箱", required: false })
+  @IsEmail({}, { message: "邮箱格式不正确" })
   @IsOptional()
   email?: string;
 
-  @ApiProperty({ description: '手机号', required: false })
+  @ApiProperty({ description: "手机号", required: false })
   @IsString()
   @IsOptional()
   phone?: string;
 
-  @ApiProperty({ description: '头像URL', required: false })
+  @ApiProperty({ description: "头像URL", required: false })
   @IsString()
   @IsOptional()
   avatar?: string;
 }
 
 export class ChangePasswordDto {
-  @ApiProperty({ description: '旧密码' })
+  @ApiProperty({ description: "旧密码" })
   @IsString()
   @IsOptional()
   oldPassword: string;
 
-  @ApiProperty({ description: '新密码' })
+  @ApiProperty({ description: "新密码" })
   @IsString()
-  @MinLength(6, { message: '密码至少6个字符' })
+  @MinLength(6, { message: "密码至少6个字符" })
   newPassword: string;
 }