Initial PatchDL web UI

web/README.md

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+# PatchDL Web UI
+
+Standalone static UI for the planned PS5 `patchdl.elf` web server.
+
+Open `index.html` directly for the mock UI, or serve this directory from the
+ELF web server. The JavaScript first tries the real API and falls back to demo
+data when the API is not available.
+
+## Expected API
+
+```text
+GET  /api/status
+GET  /api/config
+POST /api/config
+GET  /api/titles
+GET  /api/downloads
+POST /api/titles/:title_id/check
+POST /api/titles/:title_id/download
+```
+
+## Policy Model
+
+The UI assumes deny-by-default behavior:
+
+```json
+{
+  "default_policy": "deny",
+  "download_dir": "/mnt/usb0/patches",
+  "install_after_download": false,
+  "delete_pkg_after_install": false,
+  "cdn_allowlist": [
+    "sgst.prod.dl.playstation.net",
+    "gst.prod.dl.playstation.net",
+    "gs2.ww.prod.dl.playstation.net"
+  ]
+}
+```
+
+Per-title modes:
+
+```text
+disabled
+download_only
+latest_compatible
+pin
+check_only
+```