Import the MetaMesh app family from Worph/AppStore

23 apps (MetaCore, the library/network/client tiers and 13 MetaFeeder*)
move out of the general-purpose Worph/AppStore into their own store so the
MetaMesh family releases on its own cadence.

- asset URLs repointed to cdn.jsdelivr.net/gh/Worph/MetaAppStore@main
- store scaffolding added (category/recommend/featured lists, licence,
  contributing, gitattributes)
- psd-source/meta-icons-v2 icon generator follows the apps

MetaMCP stays in Worph/AppStore: it is third-party metatool-ai software,
not part of MetaMesh.

category-list.json

@@ -0,0 +1,12 @@
+[
+  {
+    "name": "Developer",
+    "font": "code-greater-than-or-equal",
+    "description": "Developer Apps"
+  },
+  {
+    "name": "Media",
+    "font": "play-circle-outline",
+    "description": "Media Apps"
+  }
+]