fix: update backend solution references in deployment script and project descriptions

.gitea/workflows/deploy.yml

@@ -66,10 +66,10 @@ jobs:
       - name: Install Dependencies and Build
         run: |
           echo "Restoring backend NuGet packages..."
-          dotnet restore backend
+          dotnet restore backend/JoaoLoureiro.Portfolio.slnx
 
           echo "Building and publishing backend..."
-          dotnet publish backend --configuration Release --output ./publish
+          dotnet publish backend/JoaoLoureiro.Portfolio.slnx --configuration Release --output ./publish
 
           echo "Installing frontend dependencies..."
           cd frontend && npm install