fix: full-repo ruff lint cleanup and CI migration to uv

Resolve all 374 ruff errors across 36 Python files (E501, E702, E722,
E741, F821, F841, invalid-syntax) bringing `ruff check .` to zero
errors repo-wide with line-length=100.

Rewrite CI workflow to use uv for dependency management, whole-repo
`ruff check .`, py_compile syntax gate, and merged python-tests job.
Add pyproject.toml with ruff config and uv dependency groups.

CI structure proposed by hcm444.

9_Firmware/9_3_GUI/test_radar_dashboard.py

@@ -321,7 +321,10 @@ class TestDataRecorder(unittest.TestCase):
         os.rmdir(self.tmpdir)
 
     @unittest.skipUnless(
-        (lambda: (__import__("importlib.util") and __import__("importlib").util.find_spec("h5py") is not None))(),
+        (lambda: (
+            __import__("importlib.util")
+            and __import__("importlib").util.find_spec("h5py") is not None
+        ))(),
         "h5py not installed"
     )
     def test_record_and_stop(self):