Add ruff static analysis and a Gitea Actions release workflow

Adds ruff (lint + format check) as a dev dependency and gate, applies its
fixes across the codebase (modernized typing, safer zip usage, line
length), and adds a Gitea Actions workflow that lints, tests, builds, and
publishes to the Gitea PyPI registry on v*.*.* tag pushes.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

tests/test_cli.py

@@ -47,9 +47,7 @@ def test_apply_dry_run_matrix_radial():
 
 @pytest.mark.parametrize("mode", ["static", "scroll", "pingpong", "pulse", "wave"])
 def test_animate_dry_run_across_animation_modes(mode):
-    result = runner.invoke(
-        app, ["animate", "Tropical twilight", "--dry-run", "--mode", mode, "--dry-run-frames", "3"]
-    )
+    result = runner.invoke(app, ["animate", "Tropical twilight", "--dry-run", "--mode", mode, "--dry-run-frames", "3"])
     assert result.exit_code == 0, result.output
     assert "t=0.00s" in result.output