Complete Duplicate Environment Functionality

[soovittt]

Description

Duplicate functionality is marked as TODO but not implemented. Users cannot duplicate environments.

Current State

• TODO comment at line 390: // TODO: Implement duplicate
• No duplicate functionality
• Users must manually copy environments

Files Affected

• app/components/EnvironmentEditor.tsx:390 - Duplicate TODO
• app/lib/sceneClient.ts - Scene operations

Expected Behavior

• Duplicate environment with new name
• Option to duplicate with or without versions
• Option to duplicate with or without assets
• Quick duplicate button
• Duplicate with modifications

Acceptance Criteria

• Implement duplicate functionality
• Add duplicate button to UI
• Add duplicate options (versions, assets)
• Add duplicate with modifications
• Add tests