Fix auth redirects and add rebuild startup scripts

frontend/src/components/LoginForm.jsx

@@ -9,10 +9,12 @@ function LoginForm() {
 
   const login = async () => {
     try {
-      const res = await axios.post('/login', { username, password });
+      const res = await axios.post('/api/login', { username, password });
       localStorage.setItem('token', res.data.token);
       localStorage.setItem('role', res.data.role);
-      navigate('/');
+      navigate('/', { replace: true });
+      // ensure nav + route state reflect the new token immediately
+      window.location.href = '/';
     } catch (err) {
       alert('Login fehlgeschlagen');
     }

frontend/src/components/LogoutButton.jsx

@@ -6,7 +6,7 @@ function LogoutButton() {
 
   const logout = async () => {
     try {
-      await axios.post('/logout'); // sendet POST an /api/logout
+      await axios.post('/api/logout');
     } catch (err) {
       console.warn('Logout-Request fehlgeschlagen, ignoriere...');
     }

frontend/src/components/Md5Tool.jsx

@@ -7,7 +7,7 @@ function Md5Tool() {
 
   const hashPassword = async () => {
     try {
-      const res = await axios.post('/hash/md5', { password: input });
+      const res = await axios.post('/api/hash/md5', { password: input });
 
       setResult(res.data.md5);
     } catch (err) {