feat: Refactor Anthropic/OpenAI driver, streaming protocols and more

[tymondesigns]

This pull request introduces significant improvements to the project's configuration, dependencies, and developer tooling, with a focus on supporting a modern frontend stack (React, TypeScript, Tailwind), enhancing static analysis and formatting workflows, and updating LLM backend configuration. Below are the most important changes grouped by theme.

Frontend and Tooling Modernization

• Added a new package.json with React, TypeScript, Tailwind, Vite, and related dependencies, as well as scripts for build, lint, format, and type checking.
• Introduced a comprehensive eslint.config.js for linting JavaScript/TypeScript and React code, integrating Prettier and React Hooks rules.
• Added a new resources/css/app.css file with Tailwind CSS, custom variants, themes, and color variables for improved styling and dark mode support.

Static Analysis and Formatting Workflow Enhancements

• Updated .github/workflows/static-analysis.yml to run Rector and ECS with GitHub-friendly output, replacing the previous format check step.
• Added export-ignore rules for new frontend and config files in .gitattributes to streamline package exports.
• Updated .editorconfig to apply 2-space indentation to .tsx and .ts files, aligning with frontend conventions.

LLM Configuration and Dependency Updates

• Refactored config/cortex.php to update LLM backend configuration, add caching options, reorder providers, and introduce a default streaming protocol setting. [1] [2] [3]
• Updated composer.json dependencies and scripts to add new packages for JSON repair, caching, YAML front matter, and frontend development, and switched to parallel test execution. [1] [2] [3]

CI/CD and Static Analysis Configuration

• Added permissions to GitHub workflows for tests and static analysis to enable pull request write access. [1] [2]
• Changed Dependabot's versioning strategy to "increase-if-necessary" for composer dependencies.

Miscellaneous

• Removed obsolete instructions for PHPStan fixes and updated exclusions in static analysis config. [1] [2]