fix(deploy): bash 3.2 compat, sshpass auth, sync admin dist to public/admin

- Replace bash 4.2+ printf %(...)T with date subshell so script runs on
  the macOS-default bash 3.2.
- Add SSH_PASS_FILE / SSH_PASSWORD support via sshpass for environments
  where password auth is the only path.
- After admin npm build, rsync view/admin/dist/ into public/admin/
  (preserving UEditor and favicon) so the project rsync ships the
  admin to the path nginx actually serves from.
- Simplify rsync exclude list to drop view/admin/ wholesale.

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

pro_v3.5.1/deploy/rsync-exclude.txt

@@ -12,15 +12,5 @@ public/uploads/
 .env-huangjinfen
 view/uniapp/
 view/uniapp_v2/
-view/admin/node_modules/
-view/admin/src/
-view/admin/public/
-view/admin/.env*
-view/admin/package*.json
-view/admin/babel.config.js
-view/admin/vue.config.js
-view/admin/jest.config.js
-view/admin/alias.config.js
-view/admin/tests/
-view/admin/dist/.DS_Store
+view/admin/
 deploy/.last-release