Add file upload portal with per-customer links and WebDAV admin access

- Customer upload via token link (no login), optional password + expiry,
  drag & drop for files and folders with preserved structure
- Admin portal with setup wizard, role-based users (admin/staff),
  per-customer WebDAV access rules (read/write), session auth
- WebDAV container (Debian apache2) with htpasswd + access.conf
  auto-generated from the SQLite DB and reloaded via inotifywait
- Configurable public base URL and janitor cron interval in admin UI;
  janitor reconciles the uploads table with the filesystem

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

package.json

@@ -0,0 +1,17 @@
+{
+  "name": "simple-file-upload",
+  "version": "1.0.0",
+  "description": "Customer file upload portal with admin and WebDAV",
+  "main": "src/server.js",
+  "scripts": {
+    "start": "node src/server.js"
+  },
+  "dependencies": {
+    "bcrypt": "^5.1.1",
+    "better-sqlite3": "^11.3.0",
+    "express": "^4.21.0",
+    "express-basic-auth": "^1.2.1",
+    "multer": "^1.4.5-lts.1",
+    "nanoid": "^3.3.7"
+  }
+}