feat: major restructuring in migration to terragrunt

- migrate from individual terraform files to config-driven terragrunt module structure
- add vault_cluster module with config discovery system
- replace individual .tf files with centralized config.hcl
- restructure auth and secret backends as configurable modules
- move auth roles and secret backends to yaml-based configuration
- convert policies from .hcl to .yaml format, add rules/auth definition
- add pre-commit hooks for yaml formatting and file cleanup
- add terragrunt cache to gitignore
- update makefile with terragrunt commands and format target

policies/auth/token/create.yaml

@@ -0,0 +1,17 @@
+# Allow token creation and management
+---
+rules:
+  - path: "auth/token/create"
+    capabilities:
+      - create
+      - read
+      - update
+      - list
+  - path: "auth/token/*"
+    capabilities:
+      - create
+      - update
+
+auth:
+  approle:
+    - tf_vault