Update Hoodik build scripts and requirements

Increase default RAM to 4GB and disk to 20GB for Hoodik builds in scripts and metadata. Split frontend and backend build steps, add frontend build commands, and clean up build artifacts after installation. Update installation instructions and warnings to reflect new requirements and build times. Change default URLs to use HTTP instead of HTTPS and adjust systemd service working directory.

misc/build.func

@@ -2854,7 +2854,7 @@ build_container() {
       # Skip directories like /dev/nvidia-caps (they need special handling)
       for d in /dev/nvidia*; do
         [[ -e "$d" ]] || continue
-        [[ -d "$d" ]] && continue  # Skip directories
+        [[ -d "$d" ]] && continue # Skip directories
         NVIDIA_DEVICES+=("$d")
       done