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/bug-630.spec.ts

@@ -10,7 +10,7 @@ test.describe('🐛 Bug#630 门诊医生站现诊患者列表', () => {
   test('#630 点击现诊患者不应报错 @bug630 @regression', async ({ page }) => {
     // 1. 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();