Add PackageSource definitions for OpenSearch

Add operator and application PackageSource CRs to expose OpenSearch
in the Cozystack platform:
- opensearch-operator: operator deployment in cozy-opensearch-operator namespace
- opensearch-application: app + resource definition with cozy-lib integration

This enables OpenSearch to appear in the platform dashboard and be
deployed by tenants.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Signed-off-by: Matthieu <matthieu@hidora.com>

packages/core/platform/sources/opensearch-application.yaml

@@ -0,0 +1,28 @@
+---
+apiVersion: cozystack.io/v1alpha1
+kind: PackageSource
+metadata:
+  name: cozystack.opensearch-application
+spec:
+  sourceRef:
+    kind: OCIRepository
+    name: cozystack-packages
+    namespace: cozy-system
+    path: /
+  variants:
+    - name: default
+      dependsOn:
+        - cozystack.networking
+        - cozystack.opensearch-operator
+      libraries:
+        - name: cozy-lib
+          path: library/cozy-lib
+      components:
+        - name: opensearch
+          path: apps/opensearch
+          libraries: ["cozy-lib"]
+        - name: opensearch-rd
+          path: system/opensearch-rd
+          install:
+            namespace: cozy-system
+            releaseName: opensearch-rd

packages/core/platform/sources/opensearch-operator.yaml

@@ -0,0 +1,22 @@
+---
+apiVersion: cozystack.io/v1alpha1
+kind: PackageSource
+metadata:
+  name: cozystack.opensearch-operator
+spec:
+  sourceRef:
+    kind: OCIRepository
+    name: cozystack-packages
+    namespace: cozy-system
+    path: /
+  variants:
+  - name: default
+    dependsOn:
+    - cozystack.networking
+    - cozystack.prometheus-operator-crds
+    components:
+    - name: opensearch-operator
+      path: system/opensearch-operator
+      install:
+        namespace: cozy-opensearch-operator
+        releaseName: opensearch-operator