feat: catalogue des layouts accessible dans la web app (/layouts)

webapp_sliding.py

@@ -427,6 +427,22 @@ async def download(request):
                    "presentationml.presentation")
 
 
+async def layouts_gallery(request):
+    """Catalogue des layouts — l'index.html généré par build_gallery.py,
+    servi tel quel (toujours à jour après une régénération)."""
+    guard = require_login(request)
+    if guard:
+        return guard
+    page = BASE / "index.html"
+    if not page.exists():
+        return HTMLResponse(
+            '<p style="font-family:sans-serif;margin:40px">Galerie '
+            'absente — lancer <code>python3 build_gallery.py</code> '
+            'sur le NAS.</p>', status_code=404)
+    return FileResponse(str(page), media_type="text/html",
+                        headers={"Cache-Control": "no-store"})
+
+
 async def health(request):
     return JSONResponse({"status": "ok", "server": "webapp-sliding",
                          "version": "1.0.0"})
@@ -448,6 +464,7 @@ app = Starlette(routes=[
     Route("/p/{slug}/revise", revise, methods=["POST"]),
     Route("/p/{slug}/previews/{name}", preview_png, methods=["GET"]),
     Route("/p/{slug}/download", download, methods=["GET"]),
+    Route("/layouts", layouts_gallery, methods=["GET"]),
     Route("/health", health, methods=["GET"]),
     Mount("/static", StaticFiles(directory=str(BASE / "static")),
           name="static"),