Restructure project: Move AKS cluster to beispiel-k8s-cluster directory

Major improvements:
- Import existing Azure AKS cluster with aztfexport
- Optimize VM size from Standard_D4d_v4 to Standard_D2as_v6 (50% cost reduction)
- Configure availability zones to [1, 2]
- Add comprehensive monitoring setup:
  * New Log Analytics Workspace
  * OMS Agent integration
  * Data Collection Rule for Container Insights
  * Email alerts for CPU and Memory
- Refactor configuration:
  * Extract all values to variables.tf
  * Rename resources with meaningful names
  * Add detailed outputs.tf
- Add project documentation:
  * Comprehensive README.md
  * cluster-status-commands.md with useful Azure CLI commands
  * terraform.tfvars.example template
  * .gitignore for sensitive files

Infrastructure changes:
- Resource Group: trusted_ai_demo_rg (Germany West Central)
- AKS Cluster: trai_k8s_cluster (Kubernetes 1.33)
- Node Pool: 2-3 nodes with auto-scaling
- Network: VNet 10.0.0.0/16, Subnet 10.0.0.0/24
- Monitoring: Full Container Insights with alerts

Cost optimization: ~€75/month (down from ~€140/month)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

beispiel-terraform/beispiel-k8s-cluster/terraform.tfvars.example

@@ -0,0 +1,28 @@
+# Azure Region
+location            = "germanywestcentral"
+
+# Resource Group
+resource_group_name = "trusted_ai_demo_rg"
+
+# Virtual Network
+vnet_name           = "trusted_ai_demo_vn"
+subnet_name         = "default"
+
+# AKS Cluster Configuration
+aks_cluster_name    = "trai_k8s_cluster"
+aks_dns_prefix      = "traik8scluster"
+
+# AKS Node Pool Configuration
+aks_node_vm_size = "Standard_D2as_v6"
+aks_node_zones   = ["1", "2"]
+
+# Auto-Scaling Configuration
+aks_node_pool_min_count = 2
+aks_node_pool_max_count = 3
+
+# Alert Configuration
+# WICHTIG: Ersetzen Sie diese Email-Adresse mit Ihrer eigenen
+alert_email_address = "your-email@example.com"
+
+# Azure Subscription ID (optional, falls abweichend vom Default)
+# subscription_id = "your-subscription-id"