Refactor authentication and session management

- Removed old llm_login and session scripts, replacing them with a new structure for handling SSO login and session management.
- Introduced a new prompt system for collecting SSO redirect URLs, ensuring compliance with security protocols.
- Implemented a robust backend notification system for tracking scan initiation.
- Enhanced browser profile configuration and resource management for improved session handling.
- Added utility functions for environment variable checks and logging.
- Updated the overall architecture to improve maintainability and readability.

lib/utils/is_html.py

@@ -0,0 +1,36 @@
+import requests
+
+def is_html_url(url: str, timeout: float = 10.0) -> bool:
+    """
+    주어진 URL에 HEAD 요청을 보내고, 응답 헤더의 Content-Type이 HTML인지 확인합니다.
+    - url: 검사할 URL 문자열
+    - timeout: 요청 타임아웃(초 단위)
+    
+    반환값:
+    - Content-Type이 'text/html' 로 시작하면 True, 그렇지 않으면 False
+    """
+    
+    try:
+        with requests.get(url, timeout=timeout, stream=True) as response:
+            # 응답 코드가 200번대가 아니면 False로 간주
+            if not response.ok:
+                return False
+
+            content_type = response.headers.get('Content-Type', '')
+            # Content-Type에 'text/html'이 포함되어 있으면 HTML로 간주
+            return content_type.lower().startswith('text/html')
+    except requests.RequestException:
+        return False
+
+if __name__ == '__main__':
+    test_urls = [
+        'https://www.example.com',
+        'https://api.github.com',        # JSON API라서 HTML이 아닐 확률이 높음
+        'https://raw.githubusercontent.com'  # 텍스트 파일 등 다양한 타입
+    ]
+
+    for url in test_urls:
+        if is_html_url(url):
+            print(f"[HTML] {url}")
+        else:
+            print(f"[Not HTML] {url}")