✨ feat(vscode): 测试提示词改成可配置模板并带上工单号

启动测试会话原先硬编码发 `/pr-acceptance-testing`，不带目标，验收技能只能
反问要测哪个。现在做成 prompts/test.md 模板 + 设置里的「测试提示词」，占位符
{issueNumber} 和 {prRef}（worktree 里是分支，主仓库里是已合并的 PR）。

Claude-Session: https://claude.ai/code/session_01Kgmb1LvrPmFX3NoUDB4zZC

vscode/webview-ui/src/components/SettingsModal.tsx

@@ -25,6 +25,7 @@ interface SubmitValues {
   implementPlanPrompt: string
   autoReview: boolean
   reviewPrompt: string
+  testPrompt: string
   devBranch: string
   releaseBranchPrefix: string
   jenkinsJob: string
@@ -78,6 +79,7 @@ export interface SettingsModalProps {
   initialImplementPlanPrompt: string
   initialAutoReview: boolean
   initialReviewPrompt: string
+  initialTestPrompt: string
   initialDevBranch: string
   initialReleaseBranchPrefix: string
   initialJenkinsJob: string
@@ -167,6 +169,7 @@ export function SettingsModal({
   initialImplementPlanPrompt,
   initialAutoReview,
   initialReviewPrompt,
+  initialTestPrompt,
   initialDevBranch,
   initialReleaseBranchPrefix,
   initialJenkinsJob,
@@ -208,6 +211,7 @@ export function SettingsModal({
   const [implementPlanPrompt, setImplementPlanPrompt] = useState(initialImplementPlanPrompt)
   const [autoReview, setAutoReview] = useState(initialAutoReview)
   const [reviewPrompt, setReviewPrompt] = useState(initialReviewPrompt)
+  const [testPrompt, setTestPrompt] = useState(initialTestPrompt)
   const [devBranch, setDevBranch] = useState(initialDevBranch)
   const [releaseBranchPrefix, setReleaseBranchPrefix] = useState(initialReleaseBranchPrefix)
   const [jenkinsJob, setJenkinsJob] = useState(initialJenkinsJob)
@@ -251,6 +255,7 @@ export function SettingsModal({
     setImplementPlanPrompt(initialImplementPlanPrompt)
     setAutoReview(initialAutoReview)
     setReviewPrompt(initialReviewPrompt)
+    setTestPrompt(initialTestPrompt)
     setDevBranch(initialDevBranch)
     setReleaseBranchPrefix(initialReleaseBranchPrefix)
     setJenkinsJob(initialJenkinsJob)
@@ -342,6 +347,7 @@ export function SettingsModal({
       implementPlanPrompt,
       autoReview,
       reviewPrompt,
+      testPrompt,
       devBranch: devBranch.trim(),
       releaseBranchPrefix: releaseBranchPrefix.trim(),
       jenkinsJob: jenkinsJob.trim(),
@@ -1002,6 +1008,26 @@ export function SettingsModal({
                     className={`${inputClass} resize-y font-mono`}
                   />
                 </Field>
+
+                <Field
+                  label="测试提示词"
+                  hint={(
+                    <>
+                      可用占位符：
+                      <code>{'{issueNumber}'}</code>
+                      、
+                      <code>{'{prRef}'}</code>
+                      （worktree 里是分支，主仓库里是已合并的 PR）
+                    </>
+                  )}
+                >
+                  <textarea
+                    rows={4}
+                    value={testPrompt}
+                    onChange={e => setTestPrompt(e.target.value)}
+                    className={`${inputClass} resize-y font-mono`}
+                  />
+                </Field>
               </>
             )}