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.

README.md

@@ -103,6 +103,8 @@ Discs are matched by hash first (most precise), then serial, then filename.
 - `data/ps1_templates/` — optional PS1 Classics art templates
   (`ICON0.PNG` case frame, `PIC1.PNG` launch background); the app falls back
   to drawn art when they're absent.
+- `data/nps/` — NoPayStation TSV lists (cached here on first store scan; drop
+  `PSP_GAMES.tsv` / `PSX_GAMES.tsv` manually to work offline).
 - State dir (`~/.local/state/psp-preserve/` by default, or `$XDG_STATE_HOME/psp-preserve`):
   - `library.sqlite` — the catalog + library database.
   - `covers/` — downloaded cover cache.
@@ -282,7 +284,8 @@ Requirements & behaviour:
    writes `PSX/<TITLE_ID>/EBOOT.PBP`. Both then show up in the **Library**
    (PS1 Classics under **PS1**, PSP games under **Games**) and can be copied to
    the PSP like any other item.
-4. The TSV lists are cached in the state dir and refreshed on each store scan.
+4. The TSV lists are cached in `data/nps/` and refreshed on each store scan
+   (drop the `.tsv` files there manually to work offline).
 
 > **DRM note:** NPS content is PSN-DRM'd. To *run* it on the PSP you need the
 > [`npdrm_free`](https://github.com/qwikrazor87/npdrm_free) plugin (ARK and most