Implement story 1.1: project scaffold and verified entry points

Creates the complete src/planemapper/ layout with all module stubs,
provisioning and renderer subpackages, airports.csv data bundle,
systemd unit files, and full test scaffold. All three quality gates
pass: pytest 12/12, ruff check zero violations, ruff format clean.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/planemapper/main.py

@@ -0,0 +1,8 @@
+import logging
+
+log = logging.getLogger(__name__)
+
+
+def main() -> None:
+    logging.basicConfig(level=logging.INFO)
+    log.info("not implemented")