fix: add working-directory: ./backend to dotnet steps — resolves MSB1003

.gitea/workflows/dev.yml

@@ -20,12 +20,15 @@ jobs:
 
       - name: Restore backend
         run: dotnet restore
+        working-directory: ./backend
 
       - name: Build backend
         run: dotnet build --no-restore --configuration Release
+        working-directory: ./backend
 
       - name: Test backend
         run: dotnet test --no-build --configuration Release
+        working-directory: ./backend
 
       - name: Setup Node
         uses: actions/setup-node@v4
@@ -74,4 +77,4 @@ jobs:
         run: |
           curl -X POST -H 'Content-type: application/json' \
             --data "{\"text\":\"🚨 Extrudex dev pipeline failed. Check Gitea Actions for details.\"}" \
-            "${{ secrets.SLACK_WEBHOOK_URL }}"
+            "${{ secrets.SLACK_WEBHOOK_URL }}"