refactor(terraform): move shelly to projects/shelly_taupunktluefter and flatten core infra

terraform/README.md

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+# Core Infrastructure (Terraform) ☁️
+
+Declarative Infrastructure as Code managing external cloud services, DNS zones, and cluster identity.
+
+## Managed Resources
+
+- **OVH DNS**: Authoritative DNS zones and records (`haumdaucher.de`, `moritzgraf.de`, etc.).
+- **Authentik SSO**: Central IdP configuration, applications, proxy outposts, OIDC clients, and custom theme CSS.
+- **Google Cloud Platform**: Service accounts for Velero backups and OpenClaw calendar integration.
+- **Google Workspace**: Domain verification, MX, SPF, and DKIM DNS records.
+
+## Usage
+
+```bash
+# Initialize Terraform
+terraform init
+
+# Plan changes
+terraform plan
+
+# Apply changes
+terraform apply
+```
+
+For agent documentation and architecture guidelines, see [AGENTS.md](AGENTS.md).