feat: Implement main application shell with navigation and color scheme toggle

- Added Appshell component with responsive navbar and main content area
- Integrated ColorSchemeToggle for light/dark mode switching
- Created Welcome component with styled title and introductory text
- Developed ChatPage for LLM interaction with WebSocket support
- Implemented Biblioteca for managing notes with rich text editor
- Added LoginPage for user authentication with error handling
- Introduced MessageList and MessageBubble components for chat messages
- Styled components with CSS modules for consistent design

backend/router_v1.py

@@ -1,11 +1,11 @@
 # backend/api/router_v1.py
 
 from fastapi import APIRouter
-from backend.domains.experiments import charts_examples_endpoint_v1 as charts
-from backend.domains.experiments import ping_endpoint_v1
-from backend.domains.text_manager import text_manager_endpoint_v1
-from backend.domains.llms import llm_chat_endpoint_v1
-from backend.domains.usuarios_endpoint_v1 import router as usuarios_router
+from backend.backend_domains.experiments import charts_examples_endpoint_v1 as charts
+from backend.backend_domains.experiments import ping_endpoint_v1
+from backend.backend_domains.text_manager import text_manager_endpoint_v1
+from backend.backend_domains.llms import llm_chat_endpoint_v1
+from backend.backend_domains.usuarios_endpoint_v1 import router as usuarios_router
 
 router = APIRouter()
 router.include_router(ping_endpoint_v1.router, prefix="/ping")