feat: Implement Phase 3 modules

- Implements placeholder logic for the `agenda`, `citas`, `equipo`, `aprobaciones`, and `servicios` modules.
- Integrates all new module functions into the `button` handler in `app/main.py` to make the bot's menus functional.
- Fixes a newline formatting bug in the text responses to ensure they render correctly in Telegram.
- Updates `tasks.md` to reflect the progress on Phase 3.

app/modules/servicios.py

@@ -1,17 +1,8 @@
 # app/modules/servicios.py
 
-def get_service_info(service_name):
+def get_service_info():
     """
-    Provides information about a service.
+    Provides information about available services.
     """
-    print(f"Fetching info for service: {service_name}")
-    # TODO: Implement service information logic
-    return f"Here is information about {service_name}."
-
-def request_quote(project_details):
-    """
-    Requests a quote for a project.
-    """
-    print(f"Requesting quote for: {project_details}")
-    # TODO: Implement quote request logic
-    return "Your quote request has been received."
+    # TODO: Fetch service details from a database or config file
+    return "Ofrecemos una variedad de servicios, incluyendo:\n\n- Consultoría Estratégica\n- Desarrollo de Software\n- Talleres de Capacitación\n\n¿Sobre cuál te gustaría saber más?"