feat: Add HA Kubernetes cluster with Terraform + Ansible

- 3x CX23 control plane nodes (HA)
- 4x CX33 worker nodes
- k3s with embedded etcd
- Hetzner CCM for load balancers
- Gitea CI/CD workflows
- Backblaze B2 for Terraform state

terraform.tfvars.example

@@ -0,0 +1,23 @@
+hcloud_token = "your-hetzner-cloud-api-token-here"
+
+ssh_public_key  = "~/.ssh/hetzner_k8s.pub"
+ssh_private_key = "~/.ssh/hetzner_k8s"
+
+s3_access_key = "your-backblaze-key-id"
+s3_secret_key = "your-backblaze-application-key"
+s3_endpoint   = "https://s3.eu-central-003.backblazeb2.com"
+s3_bucket     = "k8s-terraform-state"
+
+cluster_name = "k8s-prod"
+
+control_plane_count = 3
+control_plane_type  = "cx23"
+
+worker_count = 4
+worker_type  = "cx33"
+
+location = "fsn1"
+
+allowed_ssh_ips = ["0.0.0.0/0"]
+
+allowed_api_ips = ["0.0.0.0/0"]