feat(templates): add JWT generation and expand template variable processing

- Implement generateJwt function for creating JWT tokens
- Add support for 'jwt' and 'jwt:length' template variables
- Introduce new base64 and password generation shortcuts
- Enhance template variable processing with additional utility functions

packages/server/src/templates/index.ts

@@ -63,6 +63,10 @@ export function generateBase64(length: number): string {
 		.substring(0, length);
 }
 
+export function generateJwt(length = 256): string {
+	return randomBytes(length).toString("hex");
+}
+
 /**
  * Reads a template's docker-compose.yml file
  * First tries to fetch from GitHub, falls back to local cache if fetch fails