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/server/prisma/migrations/20260709010000_member_username_backfill/migration.sql

@@ -0,0 +1,48 @@
+WITH raw_members AS (
+  SELECT member
+  FROM app_data
+  CROSS JOIN LATERAL jsonb_array_elements(
+    CASE
+      WHEN jsonb_typeof(value -> 'members') = 'array' THEN value -> 'members'
+      ELSE '[]'::jsonb
+    END
+  ) AS member
+  WHERE key = 'members'
+),
+members AS (
+  SELECT
+    NULLIF(member ->> 'id', '') AS id,
+    NULLIF(member ->> 'username', '') AS username,
+    NULLIF(member ->> 'departmentId', '') AS department_id,
+    NULLIF(member ->> 'roleId', '') AS role_id,
+    COALESCE(member ->> 'phone', '') AS phone,
+    COALESCE(member ->> 'password', '') AS password,
+    CASE
+      WHEN jsonb_typeof(member -> 'isSystem') = 'boolean' THEN (member ->> 'isSystem')::boolean
+      ELSE NULL
+    END AS is_system,
+    COUNT(*) OVER (PARTITION BY NULLIF(member ->> 'username', '')) AS username_count
+  FROM raw_members
+)
+UPDATE users AS u
+SET
+  username = CASE
+    WHEN NULLIF(u.username, '') IS NULL
+      AND m.username IS NOT NULL
+      AND m.username_count = 1
+      AND NOT EXISTS (
+        SELECT 1
+        FROM users AS other_user
+        WHERE other_user.id <> u.id
+          AND other_user.username = m.username
+      )
+      THEN m.username
+    ELSE u.username
+  END,
+  department_id = COALESCE(m.department_id, u.department_id),
+  role_id = COALESCE(m.role_id, u.role_id, 'member'),
+  phone = COALESCE(m.phone, u.phone, ''),
+  password = COALESCE(m.password, u.password, ''),
+  is_system = COALESCE(m.is_system, u.is_system, false)
+FROM members AS m
+WHERE u.id = m.id;