Refactor project structure and implement new features

- Removed unused security module and updated import paths.
- Enhanced OpenAI client with streaming capabilities for chat completions.
- Added new backend API endpoints for health check (ping).
- Established a new FastAPI application with CORS configuration.
- Created a new Appshell component for the frontend with navigation links.
- Integrated SVG icons and improved styling for the Appshell component.
- Implemented memory management for conversation history using PostgreSQL.
- Developed abstract classes for AI agents and models, with OpenAI integration.
- Added encryption utilities for secure data handling.

src/Security/Encriptar.py

@@ -0,0 +1,44 @@
+import base64
+import os
+from cryptography.fernet import Fernet
+from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
+from cryptography.hazmat.primitives import hashes
+from cryptography.hazmat.backends import default_backend
+
+class Encriptar_fernet:
+    @staticmethod
+    def _derivar_clave(password: str, salt: bytes) -> bytes:
+        """
+        Deriva una clave segura a partir de la contraseña y el salt usando PBKDF2HMAC.
+        """
+        kdf = PBKDF2HMAC(
+            algorithm=hashes.SHA256(),
+            length=32,
+            salt=salt,
+            iterations=100_000,
+            backend=default_backend()
+        )
+        return base64.urlsafe_b64encode(kdf.derive(password.encode()))
+
+    @classmethod
+    def encriptar(cls, texto: str, password: str) -> bytes:
+        """
+        Encripta un texto con una clave derivada de la contraseña + salt aleatorio.
+        El salt es embebido al inicio del token cifrado.
+        """
+        salt = os.urandom(16)  # 128 bits de salt aleatorio
+        key = cls._derivar_clave(password, salt)
+        fernet = Fernet(key)
+        token = fernet.encrypt(texto.encode('utf-8'))
+        return salt + token  # Embebemos el salt al principio
+
+    @classmethod
+    def desencriptar(cls, token_con_salt: bytes, password: str) -> str:
+        """
+        Extrae el salt del token, deriva la clave, y desencripta el texto.
+        """
+        salt = token_con_salt[:16]
+        token = token_con_salt[16:]
+        key = cls._derivar_clave(password, salt)
+        fernet = Fernet(key)
+        return fernet.decrypt(token).decode('utf-8')