fix: add project-local iOpenPod/ fallback so /tmp cleanup won't break the app

.gitignore

@@ -38,3 +38,4 @@ converted/
 specs.md
 *.AppImage
 squashfs-root/
+iOpenPod/

src/ipod_nano7_db.py

@@ -54,6 +54,7 @@ def _find_iop_root() -> str:
                 return os.path.dirname(parent)
 
     fallbacks = [
+        os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(__file__))), "iOpenPod"),
         "/tmp/iOpenPod",
         os.path.join(os.path.expanduser("~"), "iOpenPod"),
     ]