maintainers: update all-maintainers.nix

Automated update of the master maintainers list combining:
- Home Manager specific maintainers from modules/lib/maintainers.nix
- Nixpkgs maintainers referenced in Home Manager modules

**Added:** 1 maintainers
**Removed:** 0 maintainers
**Total:** 293 → 294 maintainers

**✅ Added:** zh4ngx

Generated by: lib/python/generate-all-maintainers.py

all-maintainers.nix

@@ -2421,6 +2421,12 @@
     name = "Jona Abdinghoff";
     source = "nixpkgs";
   };
+  zh4ngx = {
+    github = "zh4ngx";
+    githubId = 1329212;
+    name = "Andy Zhang";
+    source = "nixpkgs";
+  };
   zorrobert = {
     email = "118135271+zorrobert@users.noreply.github.com";
     github = "zorrobert";