nps: cache TSV lists in data/nps/ instead of the state dir

TSVs live with the other data assets; users can also drop PSP_GAMES.tsv /
PSX_GAMES.tsv there manually to browse offline.

app/nopaystation.py

@@ -36,8 +36,8 @@ def tsv_url(content_type: str, base: str = "") -> str:
     return f"{base}/{_TSV_NAMES.get(content_type, _TSV_NAMES['psp'])}"
 
 
-def _cache_dir() -> Path:
-    d = config.STATE_DIR / "nps"
+def _tsv_dir() -> Path:
+    d = config.DATA_DIR / "nps"
     d.mkdir(parents=True, exist_ok=True)
     return d
 
@@ -110,7 +110,7 @@ def fetch_items(content_type: str, url: str = "", timeout: int = 60) -> List[dic
     """Download (and cache) a TSV, returning parsed item dicts."""
     url = url or tsv_url(content_type)
     name = _TSV_NAMES.get(content_type, "PSP_GAMES.tsv")
-    cache = _cache_dir() / name
+    cache = _tsv_dir() / name
     if cache.is_file():
         try:
             return parse_tsv(cache.read_text(encoding="utf-8", errors="replace"), content_type)