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>

tests/conftest.py

@@ -0,0 +1,8 @@
+from pathlib import Path
+
+import pytest
+
+
+@pytest.fixture
+def tmp_config_path(tmp_path: Path) -> Path:
+    return tmp_path / "config.json"

tests/fixtures/aircraft_sample.json

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+{"aircraft": []}

tests/fixtures/airspace_sample.geojson

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+{"type": "FeatureCollection", "features": []}

tests/provisioning/test_config.py

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+def test_placeholder() -> None:
+    pass

tests/provisioning/test_location.py

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+def test_placeholder() -> None:
+    pass

tests/provisioning/test_provision_loop.py

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+def test_placeholder() -> None:
+    pass

tests/provisioning/test_tiles.py

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+def test_placeholder() -> None:
+    pass

tests/test_colours.py

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+def test_placeholder() -> None:
+    pass

tests/test_fetcher.py

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+def test_placeholder() -> None:
+    pass

tests/test_gpio_ctrl.py

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+def test_placeholder() -> None:
+    pass

tests/test_icons.py

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+def test_placeholder() -> None:
+    pass

tests/test_models.py

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+def test_placeholder() -> None:
+    pass

tests/test_pipeline.py

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+def test_placeholder() -> None:
+    pass

tests/test_projection.py

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+def test_placeholder() -> None:
+    pass

tests/test_renderer.py

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+def test_placeholder() -> None:
+    pass