refactor: add migration, seed permissions, update permissions API

feat(notes): add XLSX import island and admin route

feat(upload): add drag‑and‑drop upload, template download, UI tweaks

routes/(apps)/notes/partials/(admin)/import.tsx

@@ -0,0 +1,29 @@
+import {
+  getPartialsConfig,
+  makePartials,
+} from "$root/defaults/makePartials.tsx";
+import { FreshContext } from "$fresh/server.ts";
+import { State } from "$root/defaults/interfaces.ts";
+import ImportNotes from "../../(_islands)/ImportNotes.tsx";
+
+// deno-lint-ignore require-await
+async function ImportNotesPage(
+  _request: Request,
+  _context: FreshContext<State>,
+) {
+  return (
+    <div class="page-content">
+      <h2 class="page-title">Importer des Notes</h2>
+      <p
+        class="upload-format"
+        style="margin-bottom: 1.25rem"
+      >
+        POST /notes/api/notes
+      </p>
+      <ImportNotes />
+    </div>
+  );
+}
+
+export const config = getPartialsConfig();
+export default makePartials(ImportNotesPage);