feat: 添加用户登录授权和金币消耗功能

后端:
- 创建UserInfo实体类和数据库表
- 创建UserInfoRepository和UserInfoService
- 创建UserController处理用户登录、信息更新等API

前端:
- 创建登录授权页面(auth.vue)
- 创建金币检查工具函数(coinUtils.js)
- 更新api.js添加用户API
- 更新测算页面(bazi.vue, ziwei.vue)添加金币检查逻辑
- 更新我的账号页面显示用户信息
- 更新个人信息与权限使用记录页面

功能:
- 首次使用需要授权登录
- 自动生成随机用户名和用户ID
- 每次测算消耗1金币
- 金币不足时弹出提示
- 会员用户无需消耗金币

src/main/java/xuan/entity/UserInfo.java

@@ -0,0 +1,92 @@
+package xuan.entity;
+
+import javax.persistence.*;
+import java.time.LocalDateTime;
+
+@Entity
+@Table(name = "user_info")
+public class UserInfo {
+    
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+    
+    @Column(nullable = false, unique = true, length = 64)
+    private String openId;
+    
+    @Column(length = 50)
+    private String nickname;
+    
+    @Column(length = 255)
+    private String avatarUrl;
+    
+    @Column(length = 50)
+    private String username;
+    
+    @Column(length = 20)
+    private String userId;
+    
+    @Column(length = 20)
+    private String phone;
+    
+    private Integer vipLevel;
+    
+    private Integer coins;
+    
+    private Integer streakDays;
+    
+    @Column(nullable = false, updatable = false)
+    private LocalDateTime createTime;
+    
+    private LocalDateTime updateTime;
+    
+    @PrePersist
+    protected void onCreate() {
+        createTime = LocalDateTime.now();
+        updateTime = createTime;
+        vipLevel = 0;
+        coins = 10;
+        streakDays = 0;
+    }
+    
+    @PreUpdate
+    protected void onUpdate() {
+        updateTime = LocalDateTime.now();
+    }
+    
+    public Long getId() { return id; }
+    public void setId(Long id) { this.id = id; }
+    
+    public String getOpenId() { return openId; }
+    public void setOpenId(String openId) { this.openId = openId; }
+    
+    public String getNickname() { return nickname; }
+    public void setNickname(String nickname) { this.nickname = nickname; }
+    
+    public String getAvatarUrl() { return avatarUrl; }
+    public void setAvatarUrl(String avatarUrl) { this.avatarUrl = avatarUrl; }
+    
+    public String getUsername() { return username; }
+    public void setUsername(String username) { this.username = username; }
+    
+    public String getUserId() { return userId; }
+    public void setUserId(String userId) { this.userId = userId; }
+    
+    public String getPhone() { return phone; }
+    public void setPhone(String phone) { this.phone = phone; }
+    
+    public Integer getVipLevel() { return vipLevel; }
+    public void setVipLevel(Integer vipLevel) { this.vipLevel = vipLevel; }
+    
+    public Integer getCoins() { return coins; }
+    public void setCoins(Integer coins) { this.coins = coins; }
+    
+    public Integer getStreakDays() { return streakDays; }
+    public void setStreakDays(Integer streakDays) { this.streakDays = streakDays; }
+    
+    public LocalDateTime getCreateTime() { return createTime; }
+    public void setCreateTime(LocalDateTime createTime) { this.createTime = createTime; }
+    
+    public LocalDateTime getUpdateTime() { return updateTime; }
+    public void setUpdateTime(LocalDateTime updateTime) { this.updateTime = updateTime; }
+}