Migrate project to use pnpm with latest version

[Copilot]

Migration from Yarn to pnpm

This PR migrates the project from Yarn to pnpm (latest version 10.18.2), based on the latest dev branch.

Tasks Completed:

• Sync with latest dev branch code
• Install pnpm globally and verify version (10.18.2)
• Remove yarn.lock file
• Update package.json packageManager field to pnpm@10.18.2
• Generate pnpm-lock.yaml
• Update .gitignore for pnpm-specific files (pnpm-debug.log)
• Update README.md to replace yarn commands with pnpm
• Update railway.json build command to use pnpm
• Update .github/copilot-instructions.md with pnpm commands
• Test build process with pnpm (successful)
• Test typecheck with pnpm (successful)
• Verify all scripts work correctly with pnpm

Changes Made:

1. Package Manager: Updated from yarn@1.22.22 to pnpm@10.18.2
2. Lock Files: Removed yarn.lock and added pnpm-lock.yaml
3. Documentation: Updated README.md and copilot-instructions.md to use pnpm commands
4. Configuration: Updated railway.json to use pnpm for build commands
5. Dependencies: All dependencies installed and working correctly (216 packages)

Files Modified:

• package.json - packageManager field updated to pnpm@10.18.2
• .gitignore - Added pnpm-debug.log
• README.md - All yarn commands replaced with pnpm
• railway.json - Build command updated to use pnpm
• .github/copilot-instructions.md - Development workflow updated
• Removed yarn.lock, added pnpm-lock.yaml

Testing:

• ✅ pnpm install - All dependencies installed successfully (216 packages in 4.7s)
• ✅ pnpm build - Build completed without errors
• ✅ pnpm typecheck - Type checking passed

Branch Info:

• Base: Latest dev branch (ed75c57)
• Target: dev branch
• This PR is now properly synced with the latest dev branch which has consolidated Railway docs

Original prompt

Migrate the project into using pnpm make sure use the latest version, use the dev branch as the base code and then PR this to dev branch.

The user has attached the following files as relevant context:

• .github/copilot-instructions.md

Created from VS Code via the GitHub Pull Request extension.

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[warengonzaga]

@copilot get the latest code from the dev branch.

[Copilot]

@copilot get the latest code from the dev branch.

Updated! The PR is now based on the latest dev branch (commit ed75c57). All pnpm migration changes have been reapplied on top of the consolidated Railway documentation structure.

Changes in commit ea14c33:

• Package manager: yarn@1.22.22 → pnpm@10.18.2
• Lock files: yarn.lock removed, pnpm-lock.yaml added (216 packages)
• Documentation updated: README.md, railway.json, .github/copilot-instructions.md
• Build & typecheck verified: ✅ all passing