add dotnet backend

frontend/src/App.jsx

@@ -56,11 +56,11 @@ function App() {
         <div className="info-grid">
           <div className="info-item">
             <span className="label">Email:</span>
-            <span className="value">{userInfo.email}</span>
+            <span className="value">{userInfo.email || 'Не указан'}</span>
           </div>
           <div className="info-item">
             <span className="label">Полное имя:</span>
-            <span className="value">{userInfo.full_name}</span>
+            <span className="value">{userInfo.full_name || 'Не указано'}</span>
           </div>
           {userInfo.organization && (
             <div className="info-item">
@@ -73,7 +73,7 @@ function App() {
         <div className="roles-section">
           <h3>Роли</h3>
           <div className="roles-list">
-            {userInfo.roles.map(role => (
+            {userInfo.roles && userInfo.roles.map(role => (
               <div key={role.id} className="role-badge">
                 <span className="role-name">{role.name}</span>
                 {role.description && (
@@ -86,7 +86,7 @@ function App() {
 
         <div className="links-section">
           <h3>Доступные ресурсы</h3>
-          {userInfo.available_links.length > 0 ? (
+          {userInfo.available_links && userInfo.available_links.length > 0 ? (
             <div className="links-grid">
               {userInfo.available_links.map(link => (
                 <a