Update JWT Validator examples and documentation with key generation steps

- Updated `docker-compose-jwt-validator.yml` to reference `generate-keys.sh` for key generation.
- Revised plugin documentation to include detailed steps for generating JWT keys directly.
- Simplified configuration instructions to improve clarity and consistency.

docs/Plugins/jwt-validator.md

@@ -15,6 +15,14 @@ The JWT Validator plugin validates JWT (JSON Web Token) authentication tokens us
 
 Protect APIs and services with JWT authentication without needing application-level code.
 
+## Generating JWT Keys
+
+```bash
+# Generate RSA key pair (idempotent - skips if exists)
+[ -f jwt_private.pem ] || openssl genrsa -out jwt_private.pem 2048
+[ -f jwt_pubkey.pem ] || openssl rsa -in jwt_private.pem -pubout -out jwt_pubkey.pem
+```
+
 ## Configuration Options
 
 | Option            | Description                                                                                  | Default     |