feat: make pause idempotent and emit pause events

[AugistineCreates]

This pr closes #1544

📝 Description

This PR resolves the issue where consecutive calls to pause() would duplicate emitted events. We ensure that pause() is fully idempotent by only emitting the Paused event on an actual transition to the paused state (and similarly for unpause()).

🎯 Type of Change

• Bug fix (non-breaking change which fixes an issue)

🔧 Changes Made

Files Modified

• quicklendx-contracts/src/pause.rs — Added idempotency validation using Self::is_paused(env) before updating state or emitting events.
• quicklendx-contracts/src/test_pause.rs — Added test_pause_idempotent_no_duplicate_events to count and verify that duplicate events are not produced when pause() is called twice.

🧪 Testing

• Unit tests covering pause/unpause behavior.
• New regression test specifically validating that duplicate events are not emitted.

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[Baskarayelu]

make pause idempotent and emit pause events — good stuff, merging 👍