chore: add pre-commit hook with ruff and pytest

- Add git pre-commit hook running ruff check, ruff format, pytest
- Fix import ordering in conftest.py
- Add placeholder test for test infrastructure
- Generate flake.lock

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/animaltrack/cli.py

@@ -15,14 +15,10 @@ def main():
 
     # migrate command
     migrate_parser = subparsers.add_parser("migrate", help="Run database migrations")
-    migrate_parser.add_argument(
-        "--to", type=str, help="Migrate to specific version", default=None
-    )
+    migrate_parser.add_argument("--to", type=str, help="Migrate to specific version", default=None)
 
     # create-migration command
-    create_parser = subparsers.add_parser(
-        "create-migration", help="Create a new migration file"
-    )
+    create_parser = subparsers.add_parser("create-migration", help="Create a new migration file")
     create_parser.add_argument("description", help="Description for the migration")
 
     # seed command