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-login.spec.ts

@@ -6,7 +6,7 @@ test('debug login', async ({ page }) => {
   await page.waitForLoadState('networkidle');
   
   // 2. 调用登录 API
-  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',