Restructures tests/lint/ansible/ into five concern-keyed subdirectories
(jinja/, modules/, services/, shell/, sql/) plus the pre-existing roles/
and variables/. Each new subdir ships its own __init__.py exporting
PROJECT_ROOT and a scope-focused README.md following the project's
documentation conventions (RFC 2119 keywords, emoji-after-headline,
one-sentence-per-line, no historical context).
12 existing tests move into their concern bucket via git mv so history
follows the file. Adds tests/lint/ansible/variables/test_dotted_path_keys_exist.py
which catches the bug class where a Jinja dotted path's head resolves
via group_vars/all/ or the consuming role's own vars/defaults but a
deeper segment does not exist as a key in the dict tree (e.g. the
previous `LDAP.SERVER.REACH_DOMAIN` typo in web-app-odoo).
Touches three external references so cross-links keep resolving:
- docs/contributing/actions/testing/suppression.md (run-once, shared)
- roles/sys-svc-compose/tasks/utils/network/README.md (network-via-util)
- tests/lint/ansible/sql/test_no_inline_multiline_sql.py (self-path exclude)
