chore: scaffold python desktop app

src/grid_trading/__init__.py

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+__version__ = "0.1.0"

src/grid_trading/app.py

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+from __future__ import annotations
+
+import argparse
+import sys
+
+
+def build_parser() -> argparse.ArgumentParser:
+    parser = argparse.ArgumentParser(
+        prog="grid-trading",
+        description="Local A-share and ETF grid trading manager.",
+    )
+    parser.add_argument(
+        "--db",
+        help="Path to the SQLite database. Defaults to data/grid_trading.db.",
+    )
+    return parser
+
+
+def main(argv: list[str] | None = None) -> int:
+    parser = build_parser()
+    args = parser.parse_args(argv)
+
+    from grid_trading.ui.main_window import run_gui
+
+    return run_gui(db_path=args.db)
+
+
+if __name__ == "__main__":
+    raise SystemExit(main(sys.argv[1:]))

src/grid_trading/config.py

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+from __future__ import annotations
+
+from dataclasses import dataclass
+from decimal import Decimal
+from pathlib import Path
+
+
+PROJECT_ROOT = Path(__file__).resolve().parents[2]
+DEFAULT_DB_PATH = PROJECT_ROOT / "data" / "grid_trading.db"
+
+
+@dataclass(frozen=True)
+class DefaultFeeConfig:
+    commission_rate: Decimal = Decimal("0.00025")
+    min_commission: Decimal = Decimal("5")
+    stamp_tax_rate: Decimal = Decimal("0.0005")
+    transfer_fee_rate: Decimal = Decimal("0.00001")
+
+
+DEFAULT_FEE_CONFIG = DefaultFeeConfig()