Add vault-plugin-secrets-litellm and terraform-provider-litellm repos

Provision two new Gitea repos for the LiteLLM dynamic secrets work: the
Vault/OpenBao secrets-engine plugin and its companion Terraform provider.

- Add config/.../repository/vault-plugin-secrets-litellm.yaml
- Add config/.../repository/terraform-provider-litellm.yaml
- Default branch main, squash-only merging (allow_* flags, since the
  go-gitea/gitea provider has no default_merge_style), and branch protection
  on main requiring pre-commit/build/test checks with Owners approval

config/git.unkin.net/unkin/repository/terraform-provider-litellm.yaml

@@ -0,0 +1,18 @@
+description: "Terraform provider for the Vault/OpenBao LiteLLM dynamic secrets engine"
+private: false
+default_branch: "main"
+# Squash-only: the gitea provider has no "default merge style", so we restrict
+# the allowed styles to squash to force it.
+allow_merge_commits: false
+allow_rebase: false
+allow_rebase_explicit: false
+allow_squash_merge: true
+branch_protection:
+  - rule_name: "main"
+    enable_push: false
+    status_check_contexts:
+      - "ci/woodpecker/pr/pre-commit"
+      - "ci/woodpecker/pr/build"
+      - "ci/woodpecker/pr/test"
+    approval_whitelist_teams:
+      - "Owners"

config/git.unkin.net/unkin/repository/vault-plugin-secrets-litellm.yaml

@@ -0,0 +1,18 @@
+description: "HashiCorp Vault / OpenBao dynamic secrets engine for LiteLLM virtual keys"
+private: false
+default_branch: "main"
+# Squash-only: the gitea provider has no "default merge style", so we restrict
+# the allowed styles to squash to force it.
+allow_merge_commits: false
+allow_rebase: false
+allow_rebase_explicit: false
+allow_squash_merge: true
+branch_protection:
+  - rule_name: "main"
+    enable_push: false
+    status_check_contexts:
+      - "ci/woodpecker/pr/pre-commit"
+      - "ci/woodpecker/pr/build"
+      - "ci/woodpecker/pr/test"
+    approval_whitelist_teams:
+      - "Owners"