feat(data): 新增历史数据归属订正脚本（默认 dry-run，--apply 写库）

- companions.user_id：按昵称唯一匹配用户回填（避免重复占用）

- finance_records.user_id：按充值/提现/订单/对手方规则回填，无法唯一确定则保留不填

- 默认仅预览，幂等可重复执行；新增 npm 脚本 backfill:ownership 与回归护栏

- 文档补充订正说明（79 套件/611 用例全绿）

server/tests/backfill-ownership.spec.ts

@@ -0,0 +1,30 @@
+// 已读取AGENTS.md
+import * as fs from 'fs';
+import * as path from 'path';
+
+/**
+ * 第六十三批回归闸门：历史数据归属订正脚本（默认 dry-run，需 --apply 才写库）
+ */
+describe('第六十三批历史数据订正脚本闸门', () => {
+  const rootDir = path.resolve(__dirname, '../../');
+  const scriptPath = path.join(rootDir, 'server/scripts/backfill-ownership.ts');
+  const script = fs.readFileSync(scriptPath, 'utf-8');
+  const pkg = JSON.parse(fs.readFileSync(path.join(rootDir, 'server/package.json'), 'utf-8'));
+
+  it('脚本默认只预览，需 --apply 才写库', () => {
+    expect(script).toContain("process.argv.includes('--apply')");
+    expect(script).toContain('DRY-RUN');
+    expect(script).toContain('APPLY（写库）');
+  });
+
+  it('覆盖 companions.user_id 与 finance_records.user_id 的订正', () => {
+    expect(script).toContain('backfillCompanions');
+    expect(script).toContain('UPDATE companions SET user_id = ? WHERE id = ? AND user_id IS NULL');
+    expect(script).toContain('backfillFinanceRecords');
+    expect(script).toContain('UPDATE finance_records SET user_id = ? WHERE id = ?');
+  });
+
+  it('提供 npm 脚本入口', () => {
+    expect(pkg.scripts['backfill:ownership']).toContain('scripts/backfill-ownership.ts');
+  });
+});