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.

Apps/MetaCore/pre-install/users_database.yml

@@ -0,0 +1,10 @@
+# Authelia Users Database for MetaMesh
+# Generated by pre-install-cmd with hashed password
+users:
+  admin:
+    disabled: false
+    displayname: 'Admin'
+    password: '__PASSWORD_HASH__'
+    email: '[email protected]'
+    groups:
+      - admins