fix(FN-000): backup routine uses npx runfusion.ai; alias exposes fn/fusion

Backup automation now emits `npx runfusion.ai backup --create` so scheduled
backups work for users on the zero-install path where `fn` is not on PATH.

`runfusion.ai` also exposes `fn` and `fusion` bins, so `npm i -g runfusion.ai`
puts them on PATH (npm does not link dep bins globally). Alias only defaults
to the dashboard when invoked as `runfusion.ai` / `runfusion`; `fn` / `fusion`
forward args verbatim so bare `fn` still prints help.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/cli-alias/package.json

@@ -23,7 +23,9 @@
   "type": "module",
   "bin": {
     "runfusion.ai": "index.js",
-    "runfusion": "index.js"
+    "runfusion": "index.js",
+    "fn": "index.js",
+    "fusion": "index.js"
   },
   "files": [
     "index.js",