fix(db): relationship_types 迁移 default_role → capability_role

DatabaseInitializer 新增幂等迁移：
- 若存在 default_role 但无 capability_role，CHANGE COLUMN 重命名并保留数据
- 若两者均不存在，ADD COLUMN capability_role 默认值 parent
- 若 capability_role 已存在，跳过

cfc-backend/src/main/java/com/etotem/cfc/config/DatabaseInitializer.java

@@ -2685,6 +2685,26 @@ log.info("已添加template_id列到tasks表");
             log.warn("创建member_discount_configs表失败: {}", e.getMessage());
         }
 
+        try {
+            Integer hasCap = jdbcTemplate.queryForObject(
+                "SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'relationship_types' AND COLUMN_NAME = 'capability_role'",
+                Integer.class);
+            Integer hasDefault = jdbcTemplate.queryForObject(
+                "SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'relationship_types' AND COLUMN_NAME = 'default_role'",
+                Integer.class);
+            if (hasCap != null && hasCap == 0) {
+                if (hasDefault != null && hasDefault > 0) {
+                    jdbcTemplate.execute("ALTER TABLE relationship_types CHANGE COLUMN default_role capability_role VARCHAR(20) NOT NULL COMMENT '能力角色: parent/child'");
+                    log.info("已将relationship_types.default_role重命名为capability_role");
+                } else {
+                    jdbcTemplate.execute("ALTER TABLE relationship_types ADD COLUMN capability_role VARCHAR(20) NOT NULL DEFAULT 'parent' COMMENT '能力角色: parent/child' AFTER type_name");
+                    log.info("已添加capability_role列到relationship_types表");
+                }
+            }
+        } catch (Exception e) {
+            log.warn("relationship_types capability_role 迁移失败: {}", e.getMessage());
+        }
+
         log.info("数据库迁移完成");
 
         // ==================== 健康维度 Phase 1: health_dimension_score / health_data_source_record / health_norm_reference ====================