Apply --app-name to VS Code web page titles

VS Code's `${appName}` title variable comes from `productService.nameLong` in the
web client. code-server already injects per-request product configuration into
VS Code's web bootstrap, so set `nameShort`/`nameLong` from the existing
`--app-name` CLI arg there.

This keeps the patch minimal and makes browser tab titles honor `--app-name`
without changing unrelated product metadata.

Index: code-server/lib/vscode/src/vs/server/node/serverEnvironmentService.ts
===================================================================
--- code-server.orig/lib/vscode/src/vs/server/node/serverEnvironmentService.ts
+++ code-server/lib/vscode/src/vs/server/node/serverEnvironmentService.ts
@@ -24,6 +24,7 @@ export const serverOptions: OptionDescri
 	'disable-getting-started-override': { type: 'boolean' },
 	'locale': { type: 'string' },
 	'link-protection-trusted-domains': { type: 'string[]' },
+	'app-name': { type: 'string' },
 
 	/* ----- server setup ----- */
 
@@ -120,6 +121,7 @@ export interface ServerParsedArgs {
 	'disable-getting-started-override'?: boolean,
 	'locale'?: string
 	'link-protection-trusted-domains'?: string[],
+	'app-name'?: string,
 
 	/* ----- server setup ----- */
 
Index: code-server/lib/vscode/src/vs/server/node/webClientServer.ts
===================================================================
--- code-server.orig/lib/vscode/src/vs/server/node/webClientServer.ts
+++ code-server/lib/vscode/src/vs/server/node/webClientServer.ts
@@ -366,8 +366,11 @@ export class WebClientServer {
 			linkProtectionTrustedDomains.push(...this._productService.linkProtectionTrustedDomains);
 		}
 
+		const appName = this._environmentService.args['app-name'];
 		const productConfiguration: Partial<Mutable<IProductConfiguration>> = {
 			codeServerVersion: this._productService.codeServerVersion,
+			nameShort: appName,
+			nameLong: appName,
 			rootEndpoint: rootBase,
 			updateEndpoint: !this._environmentService.args['disable-update-check'] ? rootBase + '/update/check' : undefined,
 			logoutEndpoint: this._environmentService.args['auth'] && this._environmentService.args['auth'] !== "none" ? rootBase + '/logout' : undefined,