fix(copilot): remove process.env

[Sg312]

Summary

Brief description of what this PR does and why.

Fixes #(issue)

Type of Change

• Bug fix

Testing

How has this been tested? What should reviewers focus on?

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

Screenshots/Videos

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[greptile-apps]

Greptile Summary

This PR systematically refactors environment variable access across the copilot API endpoints to use the centralized env configuration system instead of direct process.env access. The changes affect six files in the copilot module, replacing hardcoded environment variable access with imports from @/lib/env.

The refactoring standardizes how environment variables are handled throughout the copilot system by leveraging the project's established environment configuration built on @t3-oss/env-nextjs and Zod validation. This system provides type safety, runtime validation, and better support for Docker deployments through next-runtime-env. The PR adds SERPER_API_KEY to the centralized environment schema and updates all copilot tools to use the validated environment object.

The changes touch various copilot functionality including workflow management (build-workflow.ts, edit-workflow.ts), API methods (methods/route.ts), user tools (set-environment-variables.ts), and search capabilities (online-search.ts). One file (get-user-workflow.ts) had unused environment variables removed since it only performs local database operations. This refactoring aligns the copilot module with the project's broader architecture for environment variable management and improves maintainability across the codebase.

Confidence score: 1/5

• This PR contains a critical bug that will break functionality and requires immediate attention before merging
• Score reflects a serious endpoint path mismatch in set-environment-variables.ts that will cause runtime failures
• Pay close attention to apps/sim/app/api/copilot/tools/user/set-environment-variables.ts which references a non-existent API endpoint

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