chore: add Ansible project scaffolding

Add ansible.cfg (roles_path, inventory, become, fact caching),
requirements.yml placeholder for future collections, .gitignore for
Ansible artifacts, and .ansible-lint config for code quality.

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ansible.cfg

@@ -0,0 +1,17 @@
+[defaults]
+# Where AWX/ansible looks for roles when not installed as collections.
+roles_path = ./roles
+inventory  = ./inventory/hosts.yml
+host_key_checking = False
+# Use the default configured Python interpreter on each host.
+interpreter_python = auto_silent
+# Make output readable.
+stdout_callback = yaml
+gathering = smart
+fact_caching = jsonfile
+fact_caching_connection = ./.fact_cache
+fact_caching_timeout = 86400
+
+[privilege_escalation]
+become = True
+become_method = sudo