fix: improve GitHub Actions workflows and add comprehensive AI development guidelines

[ethan-mfb]

Summary

• Fix release script path in GitHub Actions workflow (was using ../scripts/release.sh instead of ./scripts/release.sh)
• Update GitHub Actions to latest versions (checkout@v4, setup-node@v4, sonarqube-scan-action@v5)
• Change release workflow from automatic push trigger to manual workflow_dispatch
• Create comprehensive LLM_INSTRUCTIONS.md with coding standards for TypeScript, React, CSS, and testing
• Add CLAUDE.md with Claude-specific development context and commit message format
• Add GitHub Copilot instructions in VS Code settings for code generation and commit messages
• Add typecheck script to package.json
• Update package dependencies (brace-expansion to 2.0.2)
• Add Dockerfile improvements
• Remove redundant development section from README to avoid duplication with LLM instruction files