fix: CI system dependencies check before apt-get update

- Check if packages already installed with dpkg before running apt-get
- Skip apt-get update/install if all dependencies present
- Reduces CI time from ~30s to instant on subsequent runs

.forgejo/workflows/botserver.yaml

@@ -49,8 +49,17 @@ jobs:
 
       - name: Install system dependencies
         run: |
-          sudo apt-get update -qq
-          sudo apt-get install -y libpq-dev libssl-dev liblzma-dev pkg-config
+          PKGS="libpq-dev libssl-dev liblzma-dev pkg-config"
+          MISSING=""
+          for pkg in $PKGS; do
+            dpkg -s "$pkg" >/dev/null 2>&1 || MISSING="$MISSING $pkg"
+          done
+          if [ -n "$MISSING" ]; then
+            sudo apt-get update -qq -o Acquire::Retries=3 -o Acquire::http::Timeout=30
+            sudo apt-get install -y --no-install-recommends $MISSING
+          else
+            echo "All system dependencies already installed"
+          fi
 
       - name: Build BotServer
         working-directory: /opt/gbo/ci/botserver