feat: initial marketplace with gitea-tea plugin

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.claude-plugin/marketplace.json

@@ -0,0 +1,17 @@
+{
+  "name": "inmedias-claude-plugins",
+  "owner": {
+    "name": "inmedias.it",
+    "url": "https://gitea.inmedias.it/inmedias.it"
+  },
+  "metadata": {
+    "description": "Claude Code Plugins für inmedias — Skills einzeln installierbar via /plugin install <name>."
+  },
+  "plugins": [
+    {
+      "name": "gitea-tea",
+      "source": "./plugins/gitea-tea",
+      "description": "Gitea über die tea-CLI verwalten: Issues, PRs, Releases, Repos vom Terminal."
+    }
+  ]
+}