docs: add v1.1 milestone for Kubernetes deployment

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.planning/MILESTONES.md

@@ -1,5 +1,29 @@
 # Project Milestones: TaskPlanner
 
+## v1.1 Kubernetes Deployment (Shipped: 2026-02-01)
+
+**Delivered:** Helm chart for Kubernetes deployment with production-ready configuration.
+
+**Key accomplishments:**
+
+- Helm chart with configurable values for all deployment options
+- Traefik ingress with automatic Let's Encrypt TLS via cert-manager
+- Longhorn persistent storage for data durability
+- Basic authentication via Traefik middleware
+- Service naming fix to avoid SvelteKit envPrefix conflicts
+- Insecure registry configuration for internal Docker registry
+
+**Stats:**
+
+- 9 Helm chart files
+- 4 commits from v1.0 to v1.1
+
+**Git range:** `37023b2` → `e1092ce`
+
+**Deployed at:** https://task.kube2.tricnet.de
+
+---
+
 ## v1.0 MVP (Shipped: 2026-02-01)
 
 **Delivered:** Personal task and notes management with image attachments, accessible from any device via Docker deployment.
@@ -24,7 +48,7 @@
 
 **Git range:** `1681a6a` → `8793e15`
 
-**What's next:** Deploy to production, gather real-world usage feedback
+**What's next:** ✓ Deployed to production in v1.1
 
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