feat(wallet): 新增用户钱包余额查询功能

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

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+package com.yolo.keyborad.controller;
+
+import cn.dev33.satoken.stp.StpUtil;
+import com.yolo.keyborad.common.BaseResponse;
+import com.yolo.keyborad.common.ResultUtils;
+import com.yolo.keyborad.model.vo.wallet.KeyboardUserWalletRespVO;
+import com.yolo.keyborad.service.KeyboardUserWalletService;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import jakarta.annotation.Resource;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+/*
+ * @author: ziin
+ * @date: 2025/12/10
+ */
+@RestController
+@Slf4j
+@RequestMapping("/wallet")
+@Tag(name = "钱包", description = "用户钱包接口")
+public class WalletController {
+
+    @Resource
+    private KeyboardUserWalletService walletService;
+
+    @GetMapping("/balance")
+    @Operation(summary = "查询钱包余额", description = "查询当前登录用户的钱包余额")
+    public BaseResponse<KeyboardUserWalletRespVO> getBalance() {
+        Long userId = StpUtil.getLoginIdAsLong();
+        KeyboardUserWalletRespVO balance = walletService.getWalletBalance(userId);
+        return ResultUtils.success(balance);
+    }
+}