upgrade to Spring Boot 4, add webauthn support, some cleanup

jwt/src/main/java/de/bstly/we/jwt/businesslogic/JwtKeyManager.java

@@ -1,6 +1,3 @@
-/**
- * 
- */
 package de.bstly.we.jwt.businesslogic;
 
 import java.text.ParseException;

jwt/src/main/java/de/bstly/we/jwt/businesslogic/JwtUserManager.java

@@ -1,6 +1,3 @@
-/**
- * 
- */
 package de.bstly.we.jwt.businesslogic;
 
 import java.text.ParseException;

jwt/src/main/java/de/bstly/we/jwt/controller/JwtUserDataController.java

@@ -1,6 +1,3 @@
-/**
- * 
- */
 package de.bstly.we.jwt.controller;
 
 import java.text.ParseException;
@@ -106,7 +103,7 @@ public class JwtUserDataController extends BaseController {
 				throw new EntityResponseStatusException(HttpStatus.NOT_ACCEPTABLE);
 			}
 		} catch (ParseException e) {
-			throw new EntityResponseStatusException(HttpStatus.UNPROCESSABLE_ENTITY);
+			throw new EntityResponseStatusException(HttpStatus.CONFLICT);
 		} catch (JOSEException e) {
 			e.printStackTrace();
 			throw new EntityResponseStatusException(HttpStatus.INTERNAL_SERVER_ERROR);

jwt/src/main/java/de/bstly/we/jwt/model/JwtKey.java

@@ -1,6 +1,3 @@
-/**
- * 
- */
 package de.bstly.we.jwt.model;
 
 import java.time.Instant;

jwt/src/main/java/de/bstly/we/jwt/repository/JwtKeyRepository.java

@@ -1,6 +1,3 @@
-/**
- * 
- */
 package de.bstly.we.jwt.repository;
 
 import org.springframework.data.jpa.repository.JpaRepository;