Add udev debugging and systemd-dev package

- Add systemd-dev package which should provide udev.pc
- Add comprehensive debugging for udev installation
- Check for udev.pc files in /usr
- Verify pkg-config paths and PKG_CONFIG_PATH
- Test udev detection with pkg-config
- List all available udev packages

This will help diagnose why meson cannot find the udev dependency
despite libudev-dev being installed. The issue might be that
udev.pc is provided by systemd-dev package instead of libudev-dev.

.forgejo/workflows/ci.yml

@@ -86,7 +86,22 @@ jobs:
           dpkg-dev \
           signify-openbsd \
           python3-pytest \
-          libudev-dev
+          libudev-dev \
+          systemd-dev
+        
+        # Debug udev installation
+        echo "=== Debugging udev installation ==="
+        echo "Checking for udev.pc files:"
+        find /usr -name "udev.pc" 2>/dev/null || echo "No udev.pc found"
+        echo "Checking pkg-config path:"
+        pkg-config --variable pc_path pkg-config
+        echo "Checking PKG_CONFIG_PATH:"
+        echo $PKG_CONFIG_PATH
+        echo "Testing udev with pkg-config:"
+        pkg-config --exists udev && echo "udev found" || echo "udev NOT found"
+        echo "Available udev packages:"
+        pkg-config --list-all | grep udev || echo "No udev packages found"
+        echo "=== End udev debug ==="
         
         # Download libfuse source
         wget https://github.com/libfuse/libfuse/releases/download/fuse-3.10.0/fuse-3.10.0.tar.xz