Add build performance monitoring and timing

[benmed00]

Problem

No visibility into build duration, making it difficult to:

• Identify performance bottlenecks
• Track build performance over time
• Optimize build process

Expected Solution

Add a build timing script that measures and displays the total duration of the Next.js build process.

Benefits

• Track build performance over time
• Identify performance regressions
• Optimize build process based on metrics
• Monitor CI/CD pipeline performance

Related

This issue is resolved by PR #72.