feat(cf): 新增 cf_rate_tier 与 cf_transfer_record 实体/Mapper

cfc-backend/src/main/java/com/etotem/cfc/entity/CfRateTier.java

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+package com.etotem.cfc.entity;
+
+import com.baomidou.mybatisplus.annotation.IdType;
+import com.baomidou.mybatisplus.annotation.TableId;
+import com.baomidou.mybatisplus.annotation.TableName;
+import lombok.Data;
+import java.io.Serializable;
+import java.util.Date;
+
+@Data
+@TableName("cf_rate_tier")
+public class CfRateTier implements Serializable {
+    @TableId(type = IdType.AUTO)
+    private Long id;
+    private String tierName;
+    private Integer minTeamSize;
+    private Integer ratePercent;
+    private Integer sortOrder;
+    private Integer enabled;
+    private Date createdAt;
+    private Date updatedAt;
+}

cfc-backend/src/main/java/com/etotem/cfc/entity/CfTransferRecord.java

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+package com.etotem.cfc.entity;
+
+import com.baomidou.mybatisplus.annotation.IdType;
+import com.baomidou.mybatisplus.annotation.TableId;
+import com.baomidou.mybatisplus.annotation.TableName;
+import lombok.Data;
+import java.io.Serializable;
+import java.util.Date;
+
+@Data
+@TableName("cf_transfer_record")
+public class CfTransferRecord implements Serializable {
+    @TableId(type = IdType.AUTO)
+    private Long id;
+    private Long fromUserId;
+    private Long toUserId;
+    private Long familyId;
+    private Integer amount;
+    private String type;      // transfer/allocate/refund
+    private String refType;
+    private Long refId;
+    private String remark;
+    private Date createdAt;
+}

cfc-backend/src/main/java/com/etotem/cfc/mapper/CfRateTierMapper.java

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+package com.etotem.cfc.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.etotem.cfc.entity.CfRateTier;
+
+public interface CfRateTierMapper extends BaseMapper<CfRateTier> {
+}

cfc-backend/src/main/java/com/etotem/cfc/mapper/CfTransferRecordMapper.java

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+package com.etotem.cfc.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.etotem.cfc.entity.CfTransferRecord;
+
+public interface CfTransferRecordMapper extends BaseMapper<CfTransferRecord> {
+}