refactor: dynamic iOpenPod discovery, add to requirements

- Replace hardcoded /tmp/iOpenPod with importlib.util.find_spec lookup
  with fallback to /tmp/iOpenPod and ~/iOpenPod for dev/backward compat
- Add iopenpod>=1.0.53 to requirements.txt
- Remove deprecated mkdir temp/downloads/converted from install.sh
  (all paths now XDG-compliant)

install.sh

@@ -39,10 +39,6 @@ source venv/bin/activate
 echo "Installing dependencies..."
 pip3 install -r requirements.txt
 
-# Create necessary directories
-echo "Creating necessary directories..."
-mkdir -p temp downloads converted
-
 echo ""
 echo "Installation complete!"
 echo ""

requirements.txt

@@ -10,3 +10,4 @@ tqdm>=4.65.0
 musicbrainzngs>=0.7.1
 PyQt6>=6.5.0
 numpy>=1.24.0
+iopenpod>=1.0.53

src/ipod_nano7_db.py

@@ -21,6 +21,7 @@ Public API preserved for main.py compatibility:
 """
 
 import importlib
+import importlib.util
 import os
 import sys
 import hashlib
@@ -38,7 +39,33 @@ from mutagen.easyid3 import EasyID3
 
 from artwork import prepare_artwork_for_track, ArtworkEntry, write_artworkdb
 
-_IOP_ROOT = "/tmp/iOpenPod"
+def _find_iop_root() -> str:
+    """Find iOpenPod's installed location.
+
+    Tries in order:
+    1. pip-installed package (via importlib.util.find_spec)
+    2. /tmp/iOpenPod (backward compat / development)
+    """
+    for pkg in ("iTunesDB_Writer", "SQLiteDB_Writer", "ipod_device"):
+        spec = importlib.util.find_spec(pkg)
+        if spec and spec.origin:
+            parent = os.path.dirname(spec.origin)
+            if os.path.basename(parent) == pkg:
+                return os.path.dirname(parent)
+
+    fallbacks = [
+        "/tmp/iOpenPod",
+        os.path.join(os.path.expanduser("~"), "iOpenPod"),
+    ]
+    for path in fallbacks:
+        if os.path.isdir(path):
+            return path
+
+    raise ImportError(
+        "iOpenPod not found. Install with: pip install iopenpod"
+    )
+
+_IOP_ROOT = _find_iop_root()
 _IOP_CACHE: dict[str, Any] = {}
 _IOP_READY = False