Remove instanceManager config option from PHPRequestHandler

Simplify PHPRequestHandler configuration to only two options:
- php: Single PHP instance (creates SinglePHPInstanceManager internally)
- phpFactory + maxPhpInstances: Factory function (creates PHPProcessManager)

The instanceManager option was overly complex for actual use cases.

Author: adamziel

packages/php-wasm/universal/src/lib/php-request-handler.ts

@@ -89,14 +89,6 @@ export type PHPRequestHandlerFactoryArgs = PHPFactoryOptions & {
 export type PHPRequestHandlerConfiguration = BaseConfiguration & {
 	cookieStore?: CookieStore | false;
 } & (
-		| {
-				/**
-				 * Provide a custom instance manager for advanced use cases.
-				 * Use SinglePHPInstanceManager for CLI contexts with a single PHP instance.
-				 * Use PHPProcessManager for web contexts with multiple concurrent instances.
-				 */
-				instanceManager: PHPInstanceManager;
-		  }
 		| {
 				/**
 				 * Provide a single PHP instance directly.
@@ -214,9 +206,7 @@ export class PHPRequestHandler implements AsyncDisposable {
 			getFileNotFoundAction = () => ({ type: '404' }),
 		} = config;
 
-		if ('instanceManager' in config) {
-			this.processManager = config.instanceManager;
-		} else if ('php' in config) {
+		if ('php' in config) {
 			const php = config.php;
 
 			// Always set managed PHP's cwd to the document root.