Remove PHP-WASM dependencies from Studio

[bcotrim]

Related issues

• Fixes STU-960

Proposed Changes

Remove PHP-WASM packages (~1.1 GB) from the desktop app's ASAR bundle. The desktop app now uses CLI for all WordPress operations, making these dependencies redundant.

• Create local type definitions (common/types/php-versions.ts) to replace @php-wasm/universal imports
• Remove WordPress provider abstraction layer (src/lib/wordpress-provider/)
• Remove child process entry points from desktop build
• Remove getProviderConstants IPC/Redux layer - components import directly from common/constants
• Move download utilities from wp-now to src/lib/download-utils.ts
• Remove vendor/wp-now/ directory
• Move PHP-WASM packages from dependencies to devDependencies (for type checking only)
• Keep forge.config.ts ignore patterns to exclude PHP-WASM from bundle

Size reduction:

Component	Before	After	Reduction
app.asar	1.4 GB	295 MB	~1.1 GB
Total App	~3 GB	1.8 GB	~1.2 GB

Testing Instructions

1. npm install
2. npm start
3. Create a new site - verify it works
4. Start/stop sites - verify server operations work
5. Import/export a site - verify backup/restore works
6. Run tests: npm test
7. Build installer: npm run package - verify app.asar is ~295 MB

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?