style(frontend): 精简脚本语言提示并移除解释器输入框

- 脚本语言提示从大块灰色卡片改成下拉框右侧的一行说明
- Python 表单不再显示解释器输入框，固定使用 .venv 里的 Python
- 虚拟环境目录字段改为全宽并明确自动探测语义
- 非 Python 语言仍由语言自动设置 cmd.exe/node.exe/lua.exe，API 仍可传自定义 interpreter

frontend/src/components/TaskEditorModal.tsx

@@ -526,28 +526,28 @@ export function TaskEditorModal({
         </div>
 
         {actionType === 'script' ? (
-          <div className="form-grid language-grid">
-            <FormField label="脚本语言">
-              <Controller
-                control={control}
-                name="script.language"
-                render={({ field }) => (
-                  <Select
-                    className="form-select"
-                    options={SCRIPT_LANGUAGE_OPTIONS}
-                    value={field.value}
-                    onChange={(value) =>
-                      applyScriptLanguage(value as ScriptLanguage)
-                    }
-                  />
-                )}
-              />
-            </FormField>
-            <div className="language-hint">
-              <Text size="sm" tone="sub">
-                {scriptMeta.hint}
-              </Text>
+          <div className="script-language-row">
+            <div className="script-language-field">
+              <FormField label="脚本语言">
+                <Controller
+                  control={control}
+                  name="script.language"
+                  render={({ field }) => (
+                    <Select
+                      className="form-select"
+                      options={SCRIPT_LANGUAGE_OPTIONS}
+                      value={field.value}
+                      onChange={(value) =>
+                        applyScriptLanguage(value as ScriptLanguage)
+                      }
+                    />
+                  )}
+                />
+              </FormField>
             </div>
+            <Text className="script-language-hint" size="sm" tone="sub">
+              {scriptMeta.hint}
+            </Text>
           </div>
         ) : null}
 
@@ -580,34 +580,19 @@ export function TaskEditorModal({
 
             {isPythonScript ? (
               <>
-                <div className="form-grid venv-grid">
-                  <FormField
-                    label="虚拟环境目录 (可选)"
-                    htmlFor="task-venv"
-                    hint="检测到虚拟环境会自动填入，可直接修改；留空则按工作目录自动探测"
-                    error={errors.script?.venv?.message}
-                  >
-                    <Input
-                      id="task-venv"
-                      {...register('script.venv')}
-                      className="mono-input"
-                      placeholder="例如：.venv"
-                    />
-                  </FormField>
-                  <FormField
-                    label="解释器（可选）"
-                    htmlFor="task-interpreter"
-                    hint="留空自动使用虚拟环境 Python；也可以填自定义 Python 路径"
-                    error={errors.script?.interpreter?.message}
-                  >
-                    <Input
-                      id="task-interpreter"
-                      {...register('script.interpreter')}
-                      className="mono-input"
-                      placeholder="留空自动使用虚拟环境 Python"
-                    />
-                  </FormField>
-                </div>
+                <FormField
+                  label="虚拟环境目录"
+                  htmlFor="task-venv"
+                  hint="自动探测项目里的 .venv；需要时也可以手动指定。Python 任务始终使用 .venv 里的 Python"
+                  error={errors.script?.venv?.message}
+                >
+                  <Input
+                    id="task-venv"
+                    {...register('script.venv')}
+                    className="mono-input"
+                    placeholder="留空自动探测，例如 .venv"
+                  />
+                </FormField>
 
                 <VenvDetectorBar
                   workingDir={debouncedWorkingDir}