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/v245-domain-source.test.ts

@@ -36,6 +36,10 @@ test('member and dictionary stores use domain APIs as primary writes', () => {
   assert.match(storeMethodBody(members, 'createMember'), /createMemberDomain\(member,/);
   assert.match(storeMethodBody(members, 'updateMember'), /updateMemberDomain\(id,/);
   assert.match(storeMethodBody(members, 'deleteMember'), /deleteMemberDomain\(id\)/);
+  assert.doesNotMatch(storeMethodBody(members, 'fetchMembers'), /saveStored\(/);
+  assert.doesNotMatch(storeMethodBody(members, 'createMember'), /saveStored\(/);
+  assert.doesNotMatch(storeMethodBody(members, 'updateMember'), /saveStored\(/);
+  assert.doesNotMatch(storeMethodBody(members, 'deleteMember'), /saveStored\(/);
 
   assert.match(categories, /from '@\/lib\/domain-api'/);
   assert.match(storeMethodBody(categories, 'addCategory'), /createTaskCategoryDomain\(item\)/);