Enhance clean.sh to remove all Debian package building artifacts

- Added cleanup for dist/ directory Debian files (moved by build.sh)
- Added cleanup for root directory Debian files (fallback)
- Added cleanup for wssshtools/debian/ build artifacts:
  - debian/wsssh-tools/ build directory
  - debian/files
  - debian/*.debhelper* files
  - debian/*.substvars files
  - debian/debhelper-build-stamp
- Ensures complete cleanup of all Debian packaging artifacts
- Maintains existing cleanup for PyInstaller and C build artifacts

clean.sh

@@ -15,10 +15,23 @@ if [ -d "wssshtools" ]; then
 fi
 
 # Remove Debian packaging artifacts
-rm -f ../wsssh-tools*.deb
-rm -f ../wsssh-tools*.dsc
-rm -f ../wsssh-tools*.tar.gz
-rm -f ../wsssh-tools*.changes
+rm -f dist/wsssh-tools*.deb
+rm -f dist/wsssh-tools*.dsc
+rm -f dist/wsssh-tools*.tar.gz
+rm -f dist/wsssh-tools*.changes
+rm -f wsssh-tools*.deb
+rm -f wsssh-tools*.dsc
+rm -f wsssh-tools*.tar.gz
+rm -f wsssh-tools*.changes
+
+# Remove Debian build directory and artifacts
+if [ -d "wssshtools" ]; then
+    rm -rf wssshtools/debian/wsssh-tools/
+    rm -f wssshtools/debian/files
+    rm -f wssshtools/debian/*.debhelper*
+    rm -f wssshtools/debian/*.substvars
+    rm -f wssshtools/debian/debhelper-build-stamp
+fi
 
 # Optionally remove SSL certificates (uncomment if needed)
 # rm -f cert.pem key.pem