feat: implement action-specific pause controls

[Amarjeet325]

feat: implement action-specific pause controls

Closes #310

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Summary

This PR introduces granular pause controls for the smart contract, allowing specific actions to be paused independently instead of relying on a global pause mechanism. This improves security response while minimizing disruption to unaffected functionality.

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✨ Changes Implemented

• ✅ Added independent pause flags for:

  • create
  • claim
  • withdraw

• 🔒 Restricted pause/unpause operations to admin-only authorization

• 📡 Introduced new events:

  • ActionPausedEvent
  • ActionUnpausedEvent

• 🛠️ Updated core contract functions to enforce pause checks:

  • create
  • claim
  • withdraw

• 🧪 Added comprehensive unit tests covering:

  • Paused actions correctly reverting
  • Unaffected actions continuing to function normally
  • Admin-only access control for pause/unpause operations

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🎯 Why This Change?

Previously, the contract relied on a global pause mechanism, which was too broad and could unnecessarily halt all operations. This update enables:

• Targeted mitigation of vulnerabilities
• Reduced system downtime
• Improved user experience during incidents
• Safer and more flexible contract management

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⚙️ Behavior Example

If claim is paused:

• ❌ claim() → fails
• ✅ create() → works
• ✅ withdraw() → works

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🏷️ Type of Change

• Bug fix
• New feature
• Breaking change
• Security fix
• Refactor
• Documentation update
• Tests only
• Configuration / DevOps change

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🧪 Test Evidence

• New unit tests added
• All tests pass
• Coverage maintained or improved

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🔒 Notes

• Ensures fine-grained control over contract operations during emergencies
• Designed to be extensible for additional actions in the future
• Fully backward compatible (no breaking changes)

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[Amarjeet325]

Hello @Cedarich please check my PR and close issue #310