feat: config module with TOML loading

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/order_bak/config.py

@@ -0,0 +1,41 @@
+import sys
+import tomllib
+from dataclasses import dataclass
+from pathlib import Path
+
+
+@dataclass
+class Config:
+    azure_connection_string: str
+    scan_page_size: int = 500
+    scan_delay_ms: int = 200
+    scan_dir: Path = Path("./scan")
+    delete_batch_size: int = 100
+    delete_delay_ms: int = 300
+
+
+def load_config(config_path: Path) -> Config:
+    if not config_path.exists():
+        print(f"Config file not found: {config_path}")
+        sys.exit(1)
+
+    with open(config_path, "rb") as f:
+        raw = tomllib.load(f)
+
+    azure = raw.get("azure", {})
+    connection_string = azure.get("connection_string")
+    if not connection_string:
+        print("Missing azure.connection_string in config")
+        sys.exit(1)
+
+    scan = raw.get("scan", {})
+    delete = raw.get("delete", {})
+
+    return Config(
+        azure_connection_string=connection_string,
+        scan_page_size=scan.get("page_size", 500),
+        scan_delay_ms=scan.get("delay_ms", 200),
+        scan_dir=Path(scan.get("scan_dir", "./scan")),
+        delete_batch_size=delete.get("batch_size", 100),
+        delete_delay_ms=delete.get("delay_ms", 300),
+    )