feat(skills): add cozy-external-app skill for scaffolding external apps

.claude-plugin/marketplace.json

@@ -13,6 +13,12 @@
       "source": "./skills/cozy-deploy",
       "category": "infrastructure"
     },
+    {
+      "name": "cozy-external-app",
+      "description": "Scaffold a new Cozystack external app package — generates chart skeleton, ApplicationDefinition, and handles dependency integration (e.g. Immich → Postgres) via managed CNPG clusters or external secret references",
+      "source": "./skills/cozy-external-app",
+      "category": "infrastructure"
+    },
     {
       "name": "drbd-recovery",
       "description": "Diagnose and recover DRBD/LINSTOR storage issues in Kubernetes clusters — handles StandAlone, DELETING, Inconsistent, Diskless, quorum loss, bitmap errors, and other common failure modes",

README.md

@@ -24,6 +24,7 @@ Install a plugin:
 | Plugin | Description |
 | --- | --- |
 | **cozy-deploy** | Deploy a Cozystack package to a dev cluster via make + cozyhr |
+| **cozy-external-app** | Scaffold a new Cozystack external app package with dependency integration |
 | **drbd-recovery** | Diagnose and recover DRBD/LINSTOR storage issues in Kubernetes clusters |
 
 ## License

skills/cozy-external-app/.claude-plugin/plugin.json

@@ -0,0 +1,9 @@
+{
+  "name": "cozy-external-app",
+  "version": "1.0.0",
+  "description": "Scaffold a new Cozystack external app package — generates chart skeleton, ApplicationDefinition, and handles dependency integration (e.g. Immich → Postgres) via managed CNPG clusters or external secret references",
+  "author": {
+    "name": "Cozystack",
+    "url": "https://github.com/cozystack"
+  }
+}