Refactor church career validation in FalukantService

- Moved church career checks to a more logical position in the transaction flow.
- Improved error handling by ensuring character existence is validated before checking for church office.
- Cleaned up commented code for better readability and maintainability.

backend/services/falukantService.js

@@ -1769,19 +1769,16 @@ class FalukantService extends BaseService {
         return await sequelize.transaction(async (t) => {
             const user = await getFalukantUserOrFail(hashedUserId, { transaction: t });
             
-            // Prüfe, ob User eine kirchliche Karriere hat (dann nur Direktoren können verkaufen)
-            const character = await FalukantCharacter.findOne({ where: { userId: user.id }, transaction: t });
-            if (character) {
-                const churchOffice = await ChurchOffice.findOne({ where: { characterId: character.id }, transaction: t });
-                if (churchOffice) {
-                    throw new Error('churchCareerNoDirectTransactions');
-                }
-            }
-            
             const branch = await getBranchOrFail(user.id, branchId);
 
+            // Prüfe, ob User eine kirchliche Karriere hat (dann nur Direktoren können verkaufen)
             const character = await FalukantCharacter.findOne({ where: { userId: user.id }, transaction: t });
             if (!character) throw new Error('No character found for user');
+            
+            const churchOffice = await ChurchOffice.findOne({ where: { characterId: character.id }, transaction: t });
+            if (churchOffice) {
+                throw new Error('churchCareerNoDirectTransactions');
+            }
 
             const stocks = await FalukantStock.findAll({
                 where: { branchId: branch.id },
@@ -1880,15 +1877,6 @@ class FalukantService extends BaseService {
         return await sequelize.transaction(async (t) => {
             const falukantUser = await getFalukantUserOrFail(hashedUserId, { transaction: t });
             
-            // Prüfe, ob User eine kirchliche Karriere hat (dann nur Direktoren können verkaufen)
-            const character = await FalukantCharacter.findOne({ where: { userId: falukantUser.id }, transaction: t });
-            if (character) {
-                const churchOffice = await ChurchOffice.findOne({ where: { characterId: character.id }, transaction: t });
-                if (churchOffice) {
-                    throw new Error('churchCareerNoDirectTransactions');
-                }
-            }
-            
             const branch = await Branch.findOne({
                 where: { id: branchId, falukantUserId: falukantUser.id },
                 include: [{ model: FalukantStock, as: 'stocks' }],
@@ -1896,8 +1884,15 @@ class FalukantService extends BaseService {
             });
             if (!branch) throw new Error('Branch not found');
             const stockIds = branch.stocks.map(s => s.id);
+            
+            // Prüfe, ob User eine kirchliche Karriere hat (dann nur Direktoren können verkaufen)
             const character = await FalukantCharacter.findOne({ where: { userId: falukantUser.id }, transaction: t });
             if (!character) throw new Error('No character for user');
+            
+            const churchOffice = await ChurchOffice.findOne({ where: { characterId: character.id }, transaction: t });
+            if (churchOffice) {
+                throw new Error('churchCareerNoDirectTransactions');
+            }
             const inventory = await Inventory.findAll({
                 where: { stockId: stockIds },
                 include: [