chore: update default account and add example data

- Update default login email to xinmi@local.com
- Update default password to 12345678 (and bcrypt hash in crm.sql)
- Add example customers, products, and contracts to init SQL
- Fix Docker env interpolation for VITE_API_BASE_URL
- Hardcode local backend API URL in frontend .env files
- Update README and docs to reflect new default credentials

README.md

@@ -56,8 +56,8 @@ docker compose up -d --build
 - **后端接口**：[http://localhost:11001/api](http://localhost:11001/api)
 
 > **默认体验账号：**
-> 邮箱：`1655064994@qq.com`
-> 密码：`1655064994`
+> 邮箱：`xinmi@local.com`
+> 密码：`12345678`
 
 ## 💻 本地开发环境
 
@@ -83,6 +83,28 @@ npm install
 npm run dev
 ```
 
+
+
+### 截图
+
+![image-20260609182703805](images/image-20260609182703805.png)
+
+![image-20260609185946181](images/image-20260609185946181.png)
+
+![image-20260609185955487](images/image-20260609185955487.png)
+
+![image-20260609190003855](images/image-20260609190003855.png)
+
+![image-20260609190010073](images/image-20260609190010073.png)
+
+![image-20260609190018913](images/image-20260609190018913.png)
+
+![image-20260609190026708](images/image-20260609190026708.png)
+
+![image-20260609190034478](images/image-20260609190034478.png)
+
+![image-20260609190041452](images/image-20260609190041452.png)
+
 ## 📄 许可证
 
 [MIT License](LICENSE)