chore(chart): bump version to 2.6.0 with NetworkPolicy support

Bump chart version from 2.5.0 to 2.6.0 (minor version) for new feature.

Added artifacthub.io/changes annotations:
- NetworkPolicy support for network isolation and security hardening
- NOTES.txt with deployment status and configuration summary

This is a backward-compatible change:
- NetworkPolicy is disabled by default
- Existing installations will not be affected
- Users can opt-in to NetworkPolicy by setting networkPolicy.enabled=true

The NetworkPolicy feature provides enterprise-grade network security
controls for Jellyfin deployments in Kubernetes environments with
CNI plugin support.

Co-Authored-By: Claude <noreply@anthropic.com>
Signed-off-by: Aleksei Sviridkin <f@lex.la>

charts/jellyfin/Chart.yaml

@@ -8,5 +8,14 @@ keywords:
   - jellyfin
   - media
   - self-hosted
-version: 2.5.0
+version: 2.6.0
 appVersion: 10.11.2
+annotations:
+  artifacthub.io/changes: |
+    - kind: added
+      description: "Add NetworkPolicy support for network isolation and security hardening"
+      links:
+        - name: Documentation
+          url: https://kubernetes.io/docs/concepts/services-networking/network-policies/
+    - kind: added
+      description: "Add NOTES.txt with deployment status and NetworkPolicy configuration summary"