feat: initial terraform-git project

Manage Gitea resources via Terraform/Terragrunt with YAML-driven config.

Resources managed:
- Organisation (unkin)
- 28 repositories with settings
- 6 teams with members
- 13 branch protection rules
- 9 Woodpecker CI repo activations
- Deploy key module (ready, no keys yet)

Config structure: config/<service>/<org>/<type>/<object>.yaml
Consul backend for state, Vault for auth tokens.

modules/gitea_instance/modules/organisation/terraform.tf

@@ -0,0 +1,9 @@
+terraform {
+  required_version = ">= 1.10"
+  required_providers {
+    gitea = {
+      source  = "go-gitea/gitea"
+      version = "0.7.0"
+    }
+  }
+}