feat(config): add atomic configuration persistence

core/config_paths.py

@@ -14,6 +14,7 @@
 """
 import json
 import os
+import tempfile
 
 ENV_KEY = "HAOCODE_CONFIG_FILE"
 
@@ -47,6 +48,37 @@ def load_config() -> dict:
     return data
 
 
+def save_config(data: dict) -> bool:
+    """原子保存当前配置；失败时保留原文件并返回 False。"""
+    if not isinstance(data, dict):
+        print("[config] 拒绝保存：配置内容不是 JSON 对象")
+        return False
+
+    path = os.path.abspath(config_path())
+    parent = os.path.dirname(path)
+    temp_path = ""
+    try:
+        os.makedirs(parent, exist_ok=True)
+        fd, temp_path = tempfile.mkstemp(
+            prefix=".haocode_config_", suffix=".tmp", dir=parent)
+        with os.fdopen(fd, "w", encoding="utf-8") as handle:
+            json.dump(data, handle, ensure_ascii=False, indent=2)
+            handle.write("\n")
+            handle.flush()
+            os.fsync(handle.fileno())
+        os.replace(temp_path, path)
+        return True
+    except Exception as exc:
+        print(f"[config] 配置保存失败: {path}（{type(exc).__name__}）")
+        return False
+    finally:
+        if temp_path and os.path.exists(temp_path):
+            try:
+                os.remove(temp_path)
+            except OSError:
+                pass
+
+
 # ----------------------------------------------------------------------
 # P1-01：渲染窗口配置解析（render_window_mode / render_window_size）
 # 规则（与 ui/web/render_window.js 的 JS 侧守卫保持一致）：