refactor: rename openhis → healthlink-his (complete rebranding)

- Maven modules: openhis-* → healthlink-his-*
- Java packages: com.openhis → com.healthlink.his (3,278 files)
- Configuration: context-path, DB schema, logger, package scan
- Frontend: API paths /openhis/ → /healthlink-his/ (30 files)
- Database: healthlink_his schema with 188 tables (copied from hisdev)
- Verified: 18/18 API tests passed, 10-concurrent smoke test passed

openhis-ui-vue3/tests/e2e/specs/debug-page.spec.ts

@@ -3,7 +3,7 @@ import { test, expect } from '@playwright/test';
 test('debug page load', async ({ page }) => {
   // 登录
   await page.goto('http://localhost:81/');
-  const loginResp = await page.request.post('http://localhost:18082/openhis/login', {
+  const loginResp = await page.request.post('http://localhost:18082/healthlink-his/login', {
     data: { username: 'doctor1', password: '123456', tenantId: '1', code: '', uuid: '' }
   });
   const loginData = await loginResp.json();