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

domains/Llms/Modelos/Base_model.py

@@ -0,0 +1,30 @@
+from abc import ABC, abstractmethod
+
+class ModeloABC(ABC):
+    """
+    Clase base para definir la interfaz de un modelo conversacional.
+    """
+
+    def __init__(
+        self,
+        model: str,
+        temperature: float = 0.7,
+        top_p: float = 1.0,
+        top_k: int = None,
+        frecuencia_penalizacion: float = 0.0,
+        num_tokens_maximos: int = 512
+    ):
+        self.model = model
+        self.temperature = temperature
+        self.top_p = top_p
+        self.top_k = top_k
+        self.frecuencia_penalizacion = frecuencia_penalizacion
+        self.num_tokens_maximos = num_tokens_maximos
+
+    @abstractmethod
+    async def responder(self, prompt: str, system_prompt: str = "", stream: bool = False,  **kwargs) -> str:
+        """
+        Devuelve una respuesta a partir de un prompt y configuración del modelo.
+        Este método debe implementarse de forma asíncrona en las subclases.
+        """
+        pass