feat(auth): add login/password authentication strategy

- KeyDescriptor now accepts optional login field alongside keyFile
- when login is present, clicks login/password auth method, fills email+password fields, and submits
- file-key flow unchanged; validation ensures exactly one strategy is present

src/auth/auth.service.ts

@@ -14,7 +14,8 @@ import { SessionService } from '../session/session.service';
 import { EnvironmentService } from '../environment/environment.service';
 
 interface KeyDescriptor {
-  keyFile: string;
+  keyFile?: string;
+  login?: string;
   password: string;
 }
 
@@ -64,10 +65,17 @@ export class AuthService {
       throw new BadRequestException(`Cannot read key descriptor: ${keyId}`, { cause: err });
     }
 
+    const useLoginPassword = !!descriptor.login;
+
+    if (!useLoginPassword) {
+      if (!descriptor.keyFile) {
+        throw new BadRequestException(`Key descriptor for "${keyId}" must have either "login" or "keyFile"`);
+      }
       const keyFilePath = path.resolve(this.keysDir, descriptor.keyFile);
       if (!fs.existsSync(keyFilePath)) {
         throw new BadRequestException(`Key file not found: ${descriptor.keyFile}`);
       }
+    }
 
     const browser = await chromium.launch({ headless: true, executablePath: process.env.PLAYWRIGHT_CHROMIUM_EXECUTABLE_PATH });
     try {
@@ -77,6 +85,19 @@ export class AuthService {
       this.logger.log(`Navigating to ${loginUrl}`);
       await page.goto(loginUrl, { waitUntil: 'networkidle' });
 
+      if (useLoginPassword) {
+        // Click "Логін і пароль" auth method
+        await page.locator('p[aria-label="Логін і пароль"]').click();
+
+        // Fill login and password
+        await page.getByLabel('Електронна пошта').fill(descriptor.login!);
+        await page.getByLabel('Пароль').fill(descriptor.password);
+
+        // Click "Увійти"
+        await page.locator('button:has-text("Увійти")').click();
+      } else {
+        const keyFilePath = path.resolve(this.keysDir, descriptor.keyFile!);
+
         // Click "Файловий ключ" button
         await page.getByText('Файловий ключ').click();
 
@@ -91,6 +112,7 @@ export class AuthService {
 
         // Click "Продовжити"
         await page.locator('#id-app-login-file-key-sign-button').click();
+      }
 
       // Wait until redirected to cabinet
       this.logger.log(`Waiting for redirect to ${cabinetUrl}`);