feat: add per-patient Local folder in Documents page backed by Cloud Storage

- Documents page shows a "Local Folder" card for each selected patient
  with an "Open in Cloud Storage" button that deep-links to their folder
- Cloud Storage page reads ?folderId URL param on mount and auto-opens
  the folder panel for seamless navigation from Documents
- Backend: GET /api/cloud-storage/patient-folder/:patientId endpoint
  that idempotently gets or creates a top-level CloudFolder per patient
- CloudFolder schema gains optional patientId field linked to Patient
- Disk directories for cloud storage folders now use the folder's name
  (e.g. "Xiaohui Wang/") instead of the opaque "folder-{id}/" path

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/Frontend/src/pages/cloud-storage-page.tsx

@@ -1,4 +1,5 @@
-import { useState } from "react";
+import { useEffect, useState } from "react";
+import { useSearch } from "wouter";
 import { useQueryClient } from "@tanstack/react-query";
 import { Button } from "@/components/ui/button";
 import { Folder as FolderIcon, Search as SearchIcon } from "lucide-react";
@@ -20,6 +21,7 @@ export default function CloudStoragePage() {
   const { toast } = useToast();
   const { user } = useAuth();
   const qc = useQueryClient();
+  const search = useSearch();
 
   // panel open + initial folder id to show when opening
   const [panelOpen, setPanelOpen] = useState(false);
@@ -27,6 +29,16 @@ export default function CloudStoragePage() {
     number | null
   >(null);
 
+  // Deep-link: if navigated here with ?folderId=XXX, open that folder automatically
+  useEffect(() => {
+    const params = new URLSearchParams(search);
+    const id = Number(params.get("folderId"));
+    if (id > 0) {
+      setPanelInitialFolderId(id);
+      setPanelOpen(true);
+    }
+  }, [search]);
+
   // key to remount recent card to clear its internal selection when needed
   const [recentKey, setRecentKey] = useState(0);