Add `pause` / `unpause` CLI commands

[Levi-Ojukwu]

Description:

The contract has pause() and unpause() admin functions (at lib.rs:440-465) for emergency stops. These are critical safety features that allow administrators to halt all contract operations in case of a discovered vulnerability. However, the CLI has no commands to invoke them.

The CLI commands should:

• iln pause — pause the contract (requires admin authentication)
• iln unpause — unpause the contract (requires admin authentication)
• Both should display confirmation and the resulting transaction hash
• Both should check contract state before executing (e.g., don't pause if already paused)

Why it matters: Emergency pause functionality must be accessible quickly. Requiring developers to write code to pause a contract defeats the purpose of emergency controls.

Acceptance Criteria:

• Create cli/src/commands/pause.ts with pause and unpause subcommands
• Require admin authentication (use configured admin keypair)
• Display contract state after execution
• Register in cli/src/index.ts as iln pause and iln unpause
• Add tests

Relevant Files: cli/src/index.ts, contracts/invoice_liquidity/src/lib.rs:440-465

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[blurbeast]

hello my Chief, can i jump on this please ??

[grantfox-oss]

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Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #415)
2. Your PR will be reviewed by the Invoice-Liquidity-Network maintainers

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