feat: add right-click context menu with duplicate and delete actions

[guruswarupa]

Issue

feat: add context menu on project cards for quick actions (duplicate env / delete project) #892

Description

Right-clicking on a project card opens a context menu.
The context menu now includes:
Duplicate environment
Delete project

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Scope of Change

Select all applicable areas impacted by this PR:

• View (UI/UX)
• API
• CLI
• Infra / Deployment
• Docs
• Other (specify): ________

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Developer Checklist

To be completed by the developer who raised the PR.

• Add valid/relevant title for the PR
• Self-review done
• Manual dev testing done
• No secrets exposed
• No merge conflicts
• Docs added/updated (if applicable)
• Removed debug prints / secrets / sensitive data
• Unit / Integration tests passing
• Follows all standards defined in Nixopus Docs

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Reviewer Checklist

To be completed by the reviewer before merge.

• Peer review done
• No console.logs / fmt.prints left
• No secrets exposed
• If any DB migrations, migration changes are verified
• Verified release changes are production-ready

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