feat: add PromotionTierConfig entity/mapper for configurable promotion tiers

Promotion tiers (R0-R4) with configurable thresholds (minTeamSize, minReferralEarnings, minShareEarnings, profitSharePercent) for the promotion tier auto-upgrade system.

Ultraworked with Sisyphus

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

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

@@ -0,0 +1,43 @@
+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("promotion_tier_config")
+public class PromotionTierConfig implements Serializable {
+
+    @TableId(type = IdType.AUTO)
+    private Long id;
+
+    /** 等级代码: R0/R1/R2/R3/R4 */
+    private String tierCode;
+
+    /** 等级名称 */
+    private String tierName;
+
+    /** 晋级所需最小团队人数（totalTeamSize） */
+    private Integer minTeamSize;
+
+    /** 晋级所需最小累计推荐佣金（分），0表示不要求 */
+    private Integer minReferralEarnings;
+
+    /** 晋级所需最小累计消费分润（分），0表示不要求 */
+    private Integer minShareEarnings;
+
+    /** 该等级的产品P点比例(%)，如 20 表示20% */
+    private Integer profitSharePercent;
+
+    /** 排序，越大越高（用于显示顺序） */
+    private Integer sortOrder;
+
+    /** 是否启用: 1=启用, 0=禁用 */
+    private Integer enabled;
+
+    private Date createdAt;
+    private Date updatedAt;
+}

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

@@ -0,0 +1,9 @@
+package com.etotem.cfc.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.etotem.cfc.entity.PromotionTierConfig;
+import org.apache.ibatis.annotations.Mapper;
+
+@Mapper
+public interface PromotionTierConfigMapper extends BaseMapper<PromotionTierConfig> {
+}