make shutdown endpoint default

.gitea/workflows/backend.yaml

@@ -55,8 +55,8 @@ jobs:
             ~/.cargo/git
             backend/target
           key: ${{ runner.os }}-cargo-test-${{ hashFiles('backend/Cargo.lock') }}
-      - name: Build Binary with Shutdown
-        run: cargo build --features shutdown --bin nuchat
+      - name: Build Binary
+        run: cargo build --locked --bin nuchat
       - name: Run Tests
         run: ./scripts/test.sh
       - name: Upload Test Logs