feat(base): 新增基础数据六表及 V4 迁移（人员/辐射区域/拓展计划/产品/客户/归属留痕）

- TPlusSyncMixin 统一 T+ 同步预留四列（可空+普通索引，唯一键待 IT 定键后升级）
- 留痕表实体 ID 无外键冗余固化，删除保护由服务层承担
- init-dev.sql 同步六表 DDL，alembic_version 标记更新

Co-Authored-By: Claude Code <noreply@anthropic.com>

backend/app/core/constants.py

@@ -47,12 +47,25 @@ PRODUCT_CATEGORY_MUNICIPAL_WATER = "municipal_water"
 PRODUCT_CATEGORY_RAIL_TRANSIT = "rail_transit"
 PRODUCT_CATEGORIES = {PRODUCT_CATEGORY_MUNICIPAL_WATER, PRODUCT_CATEGORY_RAIL_TRANSIT}
 
+# ===== 客户分类码（customers.customer_type，计提规则匹配锚点）=====
+CUSTOMER_TYPE_PERSONAL = "personal"
+CUSTOMER_TYPE_MANAGER_PERSONAL = "manager_personal"
+CUSTOMER_TYPE_ENTERPRISE = "enterprise"
+CUSTOMER_TYPES = {
+    CUSTOMER_TYPE_PERSONAL,
+    CUSTOMER_TYPE_MANAGER_PERSONAL,
+    CUSTOMER_TYPE_ENTERPRISE,
+}
+
 # ===== 操作日志词表（operation_logs 的 module / action 取值）=====
 # 集中定义避免各处硬编码导致日志值漂移；前端筛选下拉项与此保持一致
 MODULE_USER = "用户管理"
 MODULE_ROLE = "角色管理"
 MODULE_BUSINESS_ROLE = "岗位角色"
 MODULE_PARAM = "计提参数"
+MODULE_PERSONNEL = "人员管理"
+MODULE_PRODUCT = "产品管理"
+MODULE_CUSTOMER = "客户管理"
 
 ACTION_CREATE = "新增"
 ACTION_UPDATE = "修改"