refactor(autoscript): 对象化 ASEngine、移除旧变量导出、清理编排窗口解析逻辑

- ASEngine 转为类，目标变量注册作为 __init__ 接口，配套函数提取到 _helpers.py
- Lua 函数重命名 CURRENT_DATE→datenow, CURRENT_TIME→timenow, date_add→dateadd 等
- __init__.py 移除 ALL_VARIABLES/_TARGET_VAR_DEFS/_MOCK_TYPE_VALUES 导出，替换为接口函数
- 编排窗口移除脚本→控件的反向解析逻辑，合并常量定义为查询接口
- 编辑窗口新增工具函数 Tab、Tab 键插入 4 空格、图标改用 setIcon 加载

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

src/autoscript/_helpers.py

@@ -0,0 +1,153 @@
+# -*- coding: utf-8 -*-
+"""
+Copyright (c) 2026 KenanZhu.
+All rights reserved.
+
+This software is provided "as is", without any warranty of any kind.
+You may use, modify, and distribute this file under the terms of the MIT License.
+See the LICENSE file for details.
+"""
+from datetime import (
+    date,
+    datetime,
+)
+
+
+_TYPE_DEFAULT_VAR: dict[str, str | int | float | bool] = {
+    "String": "",
+    "Int": 0,
+    "Float": 0.0,
+    "Boolean": False,
+}
+
+
+def _navigatePath(
+    data: dict,
+    keyPath: list,
+    default=None,
+):
+
+    d = data
+    for key in keyPath[:-1]:
+        d = d.get(key, {})
+        if not isinstance(d, dict):
+            return default
+    return d.get(keyPath[-1], default)
+
+def _assignPath(
+    data: dict,
+    keyPath: list,
+    value,
+) -> None:
+
+    d = data
+    for key in keyPath[:-1]:
+        d = d.setdefault(key, {})
+    d[keyPath[-1]] = value
+
+def _checkDateFormat(
+    dateStr: str,
+    varName: str = "",
+) -> None:
+
+    prefix = f"Date 类型变量 '{varName}' 的" if varName else ""
+    try:
+        date.fromisoformat(dateStr)
+    except ValueError:
+        raise ValueError(
+            f"{prefix}值 '{dateStr}' 不是合法的日期格式，"
+            f"应为 YYYY-MM-DD"
+        )
+
+def _checkTimeFormat(
+    timeStr: str,
+    varName: str = "",
+) -> None:
+
+    prefix = f"Time 类型变量 '{varName}' 的" if varName else ""
+    try:
+        datetime.strptime(timeStr, "%H:%M")
+    except ValueError:
+        raise ValueError(
+            f"{prefix}值 '{timeStr}' 不是合法的时间格式，"
+            f"应为 HH:MM"
+        )
+
+def _checkType(
+    varName: str,
+    varType: str,
+    value,
+) -> None:
+
+    if varType == "Date":
+        if not isinstance(value, str):
+            raise ValueError(
+                f"Date 类型变量 '{varName}' 只能接受日期字符串，"
+                f"不能接受 {_pyTypeToASType(value)} 类型"
+            )
+        _checkDateFormat(value, varName)
+        return
+    if varType == "Time":
+        if not isinstance(value, str):
+            raise ValueError(
+                f"Time 类型变量 '{varName}' 只能接受时间字符串，"
+                f"不能接受 {_pyTypeToASType(value)} 类型"
+            )
+        _checkTimeFormat(value, varName)
+        return
+    if varType == "Int":
+        if isinstance(value, bool):
+            raise ValueError(
+                f"Int 类型变量 '{varName}' 不能接受 Boolean 类型的值"
+            )
+        if not isinstance(value, int) and not (isinstance(value, float) and value == int(value)):
+            raise ValueError(
+                f"Int 类型变量 '{varName}' 不能接受 {_pyTypeToASType(value)} 类型的值"
+            )
+        return
+    if varType == "Float":
+        if isinstance(value, bool):
+            raise ValueError(
+                f"Float 类型变量 '{varName}' 不能接受 Boolean 类型的值"
+            )
+        if not isinstance(value, (int, float)):
+            raise ValueError(
+                f"Float 类型变量 '{varName}' 不能接受 {_pyTypeToASType(value)} 类型的值"
+            )
+        return
+    if varType == "Boolean":
+        if not isinstance(value, bool):
+            raise ValueError(
+                f"Boolean 类型变量 '{varName}' 不能接受 {_pyTypeToASType(value)} 类型的值"
+            )
+        return
+    if varType == "String":
+        if not isinstance(value, str):
+            raise ValueError(
+                f"String 类型变量 '{varName}' 不能接受 {_pyTypeToASType(value)} 类型的值"
+            )
+        return
+
+def _pyTypeToASType(
+    value,
+) -> str:
+
+    if isinstance(value, bool):
+        return "Boolean"
+    if isinstance(value, int):
+        return "Int"
+    if isinstance(value, float):
+        return "Float"
+    if isinstance(value, str):
+        return "String"
+    return "Unknown"
+
+def _cleanLuaError(
+    rawMsg: str,
+) -> str:
+
+    msg = rawMsg.replace('[string "<python>"]:', "").strip()
+    stackIdx = msg.find("stack traceback:")
+    if stackIdx != -1:
+        msg = msg[:stackIdx].strip()
+    return msg