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/__init__.py

@@ -7,45 +7,25 @@ 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 autoscript.ASEngine import (
-    execute,
-    addTargetVar,
-    resetEngine,
-    META_VARS,
-)
+from autoscript.ASEngine import ASEngine
 
 
 __all__ = [
-    "execute",
-    "addTargetVar",
-    "resetEngine",
-    "registerDefaultTargetVars",
-    "buildMockTargetData",
-    "META_VARS",
-    "ALL_VARIABLES",
-    "_TARGET_VAR_DEFS",
-    "_MOCK_TYPE_VALUES",
+    "ASEngine",
+    "createEngine",
+    "createMockTargetData",
+    "createAllVariablesTable",
+    "createTargetVarDefs",
 ]
 
 
-# Key paths into target_data dict for each target variable.
-# (name, type, key_path, display_name)
 _TARGET_VAR_DEFS = [
-    ("USERNAME",           "String", ["username"],                           "用户名"),
-    ("USER_ENABLE",        "Boolean",["enabled"],                            "用户启用"),
-    ("RESERVE_DATE",       "Date",   ["reserve_info", "date"],               "预约日期"),
-    ("RESERVE_BEGIN_TIME", "Time",   ["reserve_info", "begin_time", "time"], "预约开始时间"),
-    ("RESERVE_END_TIME",   "Time",   ["reserve_info", "end_time",   "time"], "预约结束时间"),
+    ("USERNAME",           "String",  ["username"],                           "用户名"),
+    ("USER_ENABLE",        "Boolean", ["enabled"],                            "用户启用"),
+    ("RESERVE_DATE",       "Date",    ["reserve_info", "date"],               "预约日期"),
+    ("RESERVE_BEGIN_TIME", "Time",    ["reserve_info", "begin_time", "time"], "预约开始时间"),
+    ("RESERVE_END_TIME",   "Time",    ["reserve_info", "end_time",   "time"], "预约结束时间"),
 ]
-
-# All variables (display_name -> (name, type)), derived from target vars + meta vars.
-ALL_VARIABLES = {
-    display_name: (name, var_type)
-    for name, var_type, _, display_name in _TARGET_VAR_DEFS
-} | {
-    v["display"]: (v["name"], v["type"])
-    for v in META_VARS.values()
-}
 _MOCK_TYPE_VALUES = {
     "String": "__mock__",
     "Boolean": True,
@@ -55,26 +35,32 @@ _MOCK_TYPE_VALUES = {
     "Float": 0.0,
 }
 
-def buildMockTargetData(
+
+def createAllVariablesTable(
 ) -> dict:
-    """
-        Build a target_data dict filled with type-appropriate mock values
-        for all registered target variables.
-    """
+
+    return {
+        displayName: (name, varType)
+        for name, varType, _, displayName in _TARGET_VAR_DEFS
+    }
+
+def createTargetVarDefs(
+) -> list:
+
+    return list(_TARGET_VAR_DEFS)
+
+def createMockTargetData(
+) -> dict:
+
     data = {}
-    for _, var_type, key_path, _ in _TARGET_VAR_DEFS:
+    for _, varType, keyPath, _ in _TARGET_VAR_DEFS:
         d = data
-        for key in key_path[:-1]:
+        for key in keyPath[:-1]:
             d = d.setdefault(key, {})
-        d[key_path[-1]] = _MOCK_TYPE_VALUES.get(var_type, "")
+        d[keyPath[-1]] = _MOCK_TYPE_VALUES.get(varType, "")
     return data
 
-def registerDefaultTargetVars(
-) -> None:
-    """
-        Register all built-in target variables with the engine.
-        This must be called before any script execution.
-        Calling multiple times is idempotent (re-registers same keys).
-    """
-    for name, var_type, key_path, display_name in _TARGET_VAR_DEFS:
-        addTargetVar(name, var_type, key_path, display_name)
+def createEngine(
+) -> ASEngine:
+
+    return ASEngine(_TARGET_VAR_DEFS)