feat(security): 添加 JWT 认证功能

- 在后端添加 JWT 认证过滤器 JwtAuthenticationTokenFilter
- 创建 JwtTokenUtil 工具类用于生成和验证 JWT token
- 在 application.yml 中配置 JWT 相关参数
- 更新前端 HomePage 组件，增加用户认证相关逻辑

biji-houdaun/src/main/java/com/test/bijihoudaun/controller/UserController.java

@@ -12,6 +12,10 @@ import org.springframework.web.bind.annotation.DeleteMapping;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
+
+import java.util.HashMap;
+import java.util.Map;
+
 @Tag(name = "用户接口")
 @RestController
 @RequestMapping("/api/user")
@@ -36,8 +40,11 @@ public class UserController {
             @Parameter(name = "password", description = "密码",required = true)
     })
     @PostMapping("/login")
-    public R<User> login(String username, String password){
-        return R.success(userService.login(username,password));
+    public R<Map<String, String>> login(String username, String password){
+        String token = userService.login(username, password);
+        Map<String, String> tokenMap = new HashMap<>();
+        tokenMap.put("token", token);
+        return R.success(tokenMap);
     }
 
     @Operation(summary = "用户删除")