nas-samba v2.0.0: per-user home directories, Samba accounts, remove quotas

- Each user gets a Linux + Samba account and home dir at /nas/home/<username>/
- Web UI file browsing scoped to per-user directories
- Creating/deleting users from web UI also manages system + Samba accounts
- Replaced hardcoded [data] SMB share with [homes] (per-user automatic shares)
- Removed hardcoded alexz user from entrypoint — server.js handles all user management
- Removed storage quotas from backend and frontend
- Existing users get home directories auto-created on startup (migration)

apps/nas-samba/source/app/frontend/build/asset-manifest.json

@@ -1,13 +1,13 @@
 {
   "files": {
-    "main.css": "/static/css/main.f6816838.css",
-    "main.js": "/static/js/main.2e7681ef.js",
+    "main.css": "/static/css/main.6f136b27.css",
+    "main.js": "/static/js/main.f1998df4.js",
     "index.html": "/index.html",
-    "main.f6816838.css.map": "/static/css/main.f6816838.css.map",
-    "main.2e7681ef.js.map": "/static/js/main.2e7681ef.js.map"
+    "main.6f136b27.css.map": "/static/css/main.6f136b27.css.map",
+    "main.f1998df4.js.map": "/static/js/main.f1998df4.js.map"
   },
   "entrypoints": [
-    "static/css/main.f6816838.css",
-    "static/js/main.2e7681ef.js"
+    "static/css/main.6f136b27.css",
+    "static/js/main.f1998df4.js"
   ]
 }