ps1: official-style ICON0/PIC0/PIC1 artwork with PSN templates

Replaces the letterboxed 144x80 icon + cropped PIC1 with official-looking
PS1 Classics art:
- ICON0 (80x80): cover art composited into the bundled case frame (PS logo
  + 'PlayStation.' wordmark) from data/ps1_templates/ICON0.PNG.
- PIC0 (310x180): a PSN-style info board drawn in code — title, IGDB
  description, ESRB badge (from IGDB age_ratings) and PS3/PSP badges.
- PIC1 (480x272): the bundled launch background template.

The converter now embeds PIC0, the PS1 tab previews all three images, and
ps1_art pulls IGDB description/ESRB as best effort. Templates are git-ignored
(user-supplied, like base.PBP) with a drawn-art fallback when missing.

README.md

@@ -97,6 +97,9 @@ Discs are matched by hash first (most precise), then serial, then filename.
   + a base `PARAM.SFO`/icon for PS1 conversion (git-ignored, copyrighted).
 - `data/loader/DATA.PSP` + `data/loader/KEYS.BIN` — bundled plain-ELF POPS
   loader and NPDRM version key (from iPoPS, MIT).
+- `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.
 - State dir (`~/.local/state/psp-preserve/` by default, or `$XDG_STATE_HOME/psp-preserve`):
   - `library.sqlite` — the catalog + library database.
   - `covers/` — downloaded cover cache.
@@ -203,10 +206,16 @@ PS1 discs (pending) and converted EBOOTs also show up in the **Library** tab
   `STARTDAT` PGD), ready to copy to `<PSP>/PSP/GAME/<Game ID>/`. Compatible
   with CFW POPS (ARK-4/ARK-5).
 - **Artwork** — the converter fetches the game's real cover art (libretro /
-  ScreenScraper / IGDB / Wikipedia, reusing the local cover cache) and bakes
-  it into the EBOOT's `ICON0` (144×80 XMB icon) and `PIC1` (480×272 launch
-  background), so the PSP shows the actual game rather than the default PS1
-  icon. Falls back to the base icon when no art is found.
+  ScreenScraper / IGDB / Wikipedia, reusing the local cover cache) and builds
+  official-style PS1 Classics art:
+  - `ICON0` (80×80) — the cover composited into the bundled case frame
+    (`data/ps1_templates/ICON0.PNG`) with the PlayStation logo + wordmark;
+  - `PIC0` (310×180) — a PSN-style info board with the game title, a
+    description from IGDB, an ESRB rating badge and PS3/PSP platform badges;
+  - `PIC1` (480×272) — the bundled launch background
+    (`data/ps1_templates/PIC1.PNG`).
+  If the template images are missing the app falls back to drawn art, and to
+  the base icon when no cover is found.
 
 Configure the folders in **Settings → General** (or `PSP_PS1_ROOTS` /
 `PSP_PS1_OUTPUT_DIR`). Current limits: single-disc games only (no multi-disc