[wip] mediawiki-fastly-purge: init

[Mic92]

Fully typechecked but still vapourware because untested.
I got inspired by https://www.mediawiki.org/wiki/Extension:CloudflarePurge

However they use not the right API. This extension should provide the same level of cache invalidation as varnish.

[Copilot]

Pull Request Overview

This PR introduces a new MediaWiki extension for integrating with Fastly CDN for cache purging, providing an alternative to Cloudflare-based solutions. The extension implements proper event relaying and batched API calls to efficiently manage cache invalidation.

• Implements a complete MediaWiki extension with proper service wiring and configuration management
• Provides batched URL purging with soft purge capabilities to protect origin servers
• Integrates with MediaWiki's EventRelayer system for comprehensive cache invalidation

Reviewed Changes

Copilot reviewed 15 out of 17 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pkgs/mediawiki-fastly-purge/package.nix	Nix package definition for the MediaWiki extension
pkgs/mediawiki-fastly-purge/lint.nix	Development tooling for PHP linting and code quality checks
pkgs/mediawiki-fastly-purge/includes/*.php	Core extension classes implementing Fastly API integration and event handling
pkgs/mediawiki-fastly-purge/extension.json	MediaWiki extension manifest with configuration and hook definitions
pkgs/mediawiki-fastly-purge/composer.json	PHP dependency management and development scripts
pkgs/mediawiki-fastly-purge/.phan/config.php	Static analysis configuration for type checking
pkgs/mediawiki-fastly-purge/flake-module.nix	Nix flake integration for packaging and development environment
flake.nix	Root flake file updated to include the new extension module

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