refactor(data): 收口关系表运行时数据源

- 移除已迁移业务 AppData 运行时 fallback，改走领域 API 和关系表快读
- 补齐需求产品负责人、版本计划任务 JSON 和成员 username 回填迁移
- 统一治理字典入口，并补充 AI provider、数据源契约和领域服务测试

Co-Authored-By: Codex GPT-5 <codex@openai.com>

apps/web/lib/member-system.test.ts

@@ -101,6 +101,7 @@ test('resolves legacy Chen Shi labels to the built-in admin display name', () =>
 
   assert.equal(resolveMemberDisplayName('陈十', result.members), SYSTEM_ADMIN_MEMBER_NAME);
   assert.equal(resolveMemberDisplayName(SYSTEM_ADMIN_MEMBER_ID, result.members), SYSTEM_ADMIN_MEMBER_NAME);
+  assert.equal(resolveMemberDisplayName('admin', result.members), SYSTEM_ADMIN_MEMBER_NAME);
   assert.equal(resolveMemberDisplayName('张三', result.members), '张三');
 });
 
@@ -111,5 +112,6 @@ test('matches legacy admin names as the built-in admin member', () => {
   assert.equal(isMemberReference('陈十', admin), true);
   assert.equal(isMemberReference(SYSTEM_ADMIN_MEMBER_ID, admin), true);
   assert.equal(isMemberReference(SYSTEM_ADMIN_MEMBER_NAME, admin), true);
+  assert.equal(isMemberReference('admin', admin), true);
   assert.equal(isMemberReference('张三', admin), false);
 });