feat: add site assistant component for guided tool selection

- Introduced SiteAssistant component to assist users in selecting the right tools based on their queries.
- Integrated assistant into the main App component.
- Implemented message handling and storage for user-assistant interactions.
- Added quick prompts for common user queries related to tools.
- Enhanced ToolLandingPage and DownloadButton components with SharePanel for sharing tool results.
- Updated translations for new assistant features and sharing options.
- Added API methods for chat functionality with the assistant, including streaming responses.

backend/tests/conftest.py

@@ -8,6 +8,7 @@ from app import create_app
 from app.services.account_service import init_account_db
 from app.services.rating_service import init_ratings_db
 from app.services.ai_cost_service import init_ai_cost_db
+from app.services.site_assistant_service import init_site_assistant_db
 
 
 @pytest.fixture
@@ -33,6 +34,7 @@ def app():
         init_account_db()
         init_ratings_db()
         init_ai_cost_db()
+        init_site_assistant_db()
 
     # Create temp directories
     os.makedirs(app.config['UPLOAD_FOLDER'], exist_ok=True)