Address review: renamed repo watch, full checkdepends, llvm rebuild

- watch joshuaswarren/omarchy-mlx (the url= repo) instead of mlx-omarchy
- global checkdepends gains 'lapack' 'blas' 'vulkan-icd-loader' alongside
  'openblas', the shared libraries the wheel loads at check() import
- rebuild_on llvm: omarchy-mlx-vulkan links the shared libLLVM

pkgbuilds/omarchy-mlx/.omarchy/package.json

@@ -2,9 +2,12 @@
   "source": "local",
   "channels": ["edge"],
   "min_release_age": "24h",
+  "rebuild_on": [
+    "llvm"
+  ],
   "upstream": {
     "watch": {
-      "github": "joshuaswarren/mlx-omarchy",
+      "github": "joshuaswarren/omarchy-mlx",
       "pattern": "v(?P<version>[0-9]+(?:\\.[0-9]+)*)"
     }
   }