Create a Basic Tutorial for Each Supported Interface

Every tutorial here should show how to create a config with two agents that have instructions (model this off the example/helpful config).

For CLI this should show:

1. Start the agent interaction with `mada-cli`
2. Session selection
3. Prompting the agent
4. Quitting the interaction
5. Restarting the interaction with `mada-cli`
6. Selecting the session we just created to show that history is stored
7. [Optional] Updating the database to be PostgreSQL instead of SQLite

For Gradio this should show:

1. Adding Gradio interface configuration to the config file
2. Starting the Gradio interface with `mada-gradio`
3. Opening the Web UI and explaining the different parts of it
4. Initialize the orchestrator
5. Prompt the agents
6. Shut down the Gradio app in the terminal with `ctrl+C`

For OpenAI this should show:

1. Starting the OpenAI API with `mada-openai-api` (should discuss starting with an API key)
2. Opening the WebUI and explaining the different parts of it
3. Prompting the agents
4. Shutting down the OpenAI API in the terminal

Locate the existing tutorials and the example/helpful config first, then trace how the CLI, Gradio, and OpenAI interfaces are started. Create a tutorial for each interface covering configuration, startup, prompting, shutdown, and the CLI's stored-session flow; include the PostgreSQL option if supported. Done means a newcomer can follow each tutorial end to end.

Written by the indexing model from the issue text.