Add profile routes to backend and frontend; implement user state handling for holidays and workdays, and update UI components for profile settings

backend/src/repositories/WorklogRepository.js

@@ -539,21 +539,58 @@ class WorklogRepository {
    * @param {Date} endDate - End-Datum
    * @returns {Promise<Array>} Array von Holiday-Einträgen mit Datum und Stunden
    */
-  async getHolidaysInDateRange(startDate, endDate) {
-    const { Holiday } = database.getModels();
+  async getHolidaysInDateRange(startDate, endDate, userId = null) {
+    const { Holiday, State, User } = database.getModels();
     
     try {
+      // Hole User-Bundesland (falls userId angegeben)
+      let userStateId = null;
+      if (userId) {
+        const user = await User.findByPk(userId, { 
+          attributes: ['state_id'],
+          raw: true 
+        });
+        userStateId = user?.state_id;
+      }
+      
       const holidays = await Holiday.findAll({
         where: {
           date: {
             [Op.between]: [startDate, endDate]
           }
         },
-        raw: true,
+        include: [
+          {
+            model: State,
+            as: 'states',
+            attributes: ['id'],
+            through: { attributes: [] },
+            required: false
+          }
+        ],
         order: [['date', 'ASC']]
       });
 
-      return holidays;
+      // Filtere nach User-Bundesland (falls userId angegeben)
+      if (userId && userStateId) {
+        return holidays.filter(h => {
+          const holidayStates = h.states || [];
+          const isFederal = holidayStates.length === 0;
+          const appliesToUser = isFederal || holidayStates.some(s => s.id === userStateId);
+          return appliesToUser;
+        }).map(h => ({
+          date: h.date,
+          hours: h.hours,
+          description: h.description
+        }));
+      }
+      
+      // Ohne userId: Alle Feiertage zurückgeben
+      return holidays.map(h => ({
+        date: h.date,
+        hours: h.hours,
+        description: h.description
+      }));
     } catch (error) {
       console.error('Fehler beim Abrufen der Feiertage:', error);
       return [];