fix: refactor code structure of terminator cli & add gemini, openai support

[tribhuwan-kumar]

• added the gemini and openai support to terminator cli chat
• refact the code structure

new command structure

...terminator  reft-cli  .\target\release\terminator.exe --help
Terminator CLI provides tools for managing the Terminator project, including version management, releases, and development workflows.

Usage: terminator.exe <COMMAND>

Commands:
  version  Version management commands
  mcp      MCP client commands
  help     Print this message or the help of the given subcommand(s)

Options:
  -h, --help
          Print help (see a summary with '-h')

the new code structure of terminator cli:

~/terminator-cli >reft-cli >$ eza -T
.
├── Cargo.lock
├── Cargo.toml
├── README.md
└── src
    ├── bin
    │   └── cargo-terminator.rs
    ├── cli.rs
    ├── command.rs
    ├── main.rs
    ├── mpc_client
    │   ├── anthropic.rs
    │   ├── gemini.rs
    │   ├── interactive_chat.rs
    │   ├── mod.rs
    │   ├── natural_lang.rs
    │   ├── openai.rs
    │   └── utils.rs
    ├── telemetry
    │   ├── mod.rs
    │   ├── process.rs
    │   ├── receiver.rs
    │   └── traces.rs
    ├── utils.rs
    ├── version_control.rs
    └── workflow_exec
        ├── cron.rs
        ├── exec.rs
        ├── input.rs
        ├── mod.rs
        ├── parsing.rs
        ├── result.rs
        ├── validation.rs
        └── workflow.rs