✨ feat(vscode): codex 命令统一组装，模型/思考级别可在设置面板配置

新增 cc/codexCommand.ts 作为 codex 调用的唯一出口（buildCodexArgs /
buildCodexCommandString），把 exec-review / resume / interactive 三种形态
的 flag 拼装收敛到一处；模型与思考级别作为自由文本项写入全局设置并贯穿
webview 消息通道，空值则不传 -c，沿用 codex config.toml 默认。

vscode/webview-ui/src/hooks/useIssues.ts

@@ -41,6 +41,8 @@ export interface SettingsValues {
   implTabPreCreateScript: string
   implTabPostCloseScript: string
   conflictResolutionProfilePath: string
+  codexModel: string
+  codexReasoningEffort: string
   youtrackBaseUrl: string
   youtrackProjectShortName: string
   youtrackCloseCommand: string
@@ -67,6 +69,8 @@ export interface SettingsOverlayState {
   implTabPreCreateScript: string
   implTabPostCloseScript: string
   conflictResolutionProfilePath: string
+  codexModel: string
+  codexReasoningEffort: string
   youtrackBaseUrl: string
   youtrackProjectShortName: string
   youtrackCloseCommand: string
@@ -281,6 +285,8 @@ export function useIssues(): UseIssuesResult {
       implTabPreCreateScript: values.implTabPreCreateScript,
       implTabPostCloseScript: values.implTabPostCloseScript,
       conflictResolutionProfilePath: values.conflictResolutionProfilePath,
+      codexModel: values.codexModel,
+      codexReasoningEffort: values.codexReasoningEffort,
       youtrackBaseUrl: values.youtrackBaseUrl,
       youtrackProjectShortName: values.youtrackProjectShortName,
       youtrackCloseCommand: values.youtrackCloseCommand,
@@ -610,6 +616,8 @@ export function useIssues(): UseIssuesResult {
             implTabPreCreateScript: msg.implTabPreCreateScript,
             implTabPostCloseScript: msg.implTabPostCloseScript,
             conflictResolutionProfilePath: msg.conflictResolutionProfilePath,
+            codexModel: msg.codexModel,
+            codexReasoningEffort: msg.codexReasoningEffort,
             youtrackBaseUrl: msg.youtrackBaseUrl ?? '',
             youtrackProjectShortName: msg.youtrackProjectShortName ?? '',
             youtrackCloseCommand: msg.youtrackCloseCommand ?? '',