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.

environments/root.hcl

@@ -0,0 +1,39 @@
+generate "backend" {
+  path      = "backend.tf"
+  if_exists = "overwrite"
+  contents  = <<EOF
+provider "gitea" {
+  base_url    = "https://git.unkin.net"
+  cacert_file = "/etc/pki/tls/certs/ca-bundle.crt"
+}
+
+provider "woodpecker" {
+  server = "https://ci.k8s.syd1.au.unkin.net"
+}
+
+terraform {
+  backend "consul" {
+    address = "https://consul.service.consul"
+    path    = "infra/terraform/git/${path_relative_to_include()}/state"
+    scheme  = "https"
+    lock    = true
+    ca_file = "/etc/pki/tls/certs/ca-bundle.crt"
+  }
+  required_version = ">= 1.10"
+  required_providers {
+    gitea = {
+      source  = "go-gitea/gitea"
+      version = "0.7.0"
+    }
+    woodpecker = {
+      source  = "Kichiyaki/woodpecker"
+      version = "0.5.0"
+    }
+    consul = {
+      source  = "hashicorp/consul"
+      version = "2.23.0"
+    }
+  }
+}
+EOF
+}