feat: add shared utility modules

scripts/shared/__init__.py

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+"""Shared helpers for CLI scripts."""

scripts/shared/config.py

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+from __future__ import annotations
+
+from pathlib import Path
+
+BASE_DIR = Path(__file__).resolve().parent.parent.parent
+CONFIG_PATH = BASE_DIR / "config.json"
+OUTPUTS_DIR = BASE_DIR / "outputs"
+DEFAULT_COMFYUI_SERVER_URL = "http://127.0.0.1:8188"
+
+
+def default_config() -> dict[str, str]:
+    return {
+        "comfyui_server_url": DEFAULT_COMFYUI_SERVER_URL,
+        "output_dir": str(OUTPUTS_DIR),
+    }

scripts/shared/json_utils.py

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+from __future__ import annotations
+
+import json
+from pathlib import Path
+from typing import Any
+
+
+def load_json(path: str | Path) -> Any:
+    with Path(path).open("r", encoding="utf-8") as file:
+        return json.load(file)

scripts/shared/runtime_config.py

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+from __future__ import annotations
+
+from shared.config import CONFIG_PATH, default_config
+from shared.json_utils import load_json
+
+
+def get_runtime_config() -> dict[str, str]:
+    if not CONFIG_PATH.exists():
+        return default_config()
+
+    loaded = load_json(CONFIG_PATH)
+    if not isinstance(loaded, dict):
+        return default_config()
+
+    defaults = default_config()
+    return {
+        "comfyui_server_url": str(loaded.get("comfyui_server_url") or defaults["comfyui_server_url"]),
+        "output_dir": str(loaded.get("output_dir") or defaults["output_dir"]),
+    }