feat(okr-ai): AI 分析失败/空跑也写入 sync_logs

之前 AI 分析只在「有 commits 且全部成功」时写 success 日志，
出错走 .catch 只打 stdout、空跑直接 return 不写。导致 UI 同步日志页
看不出 AI 是否真的跑过、为什么没产出。

改为：
- 空跑写 success（带 "No unanalyzed commits"）
- 单仓库失败累计后写入 message 末尾
- 全仓库失败或外层异常写 status=error 并附 stack
- message 截断到 1000 字符避免超长

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

backend/src/services/okr-ai-sync.ts

@@ -504,17 +504,28 @@ export async function analyzeCommitsForOKR(dryRun = false): Promise<AnalyzeResul
   const startTime = Date.now();
   const batchId = uuid();
 
+  let totalCommits = 0;
+  let actionsExecuted = 0;
+  const summaries: { repo: string; summary: string }[] = [];
+  const repoErrors: { repo: string; error: string }[] = [];
+
+  try {
     const groups = await gatherUnanalyzedCommits();
 
     if (groups.length === 0) {
       console.info('[AI-OKR] No unanalyzed commits found, skipping');
+      const elapsed = Date.now() - startTime;
+      await db.insert(syncLogs).values({
+        id: uuid(),
+        source: 'ai_okr',
+        status: 'success',
+        message: `${dryRun ? '[DRY RUN] ' : ''}No unanalyzed commits, skipped in ${elapsed}ms`,
+        recordsProcessed: 0,
+        syncedAt: new Date(),
+      });
       return { totalCommits: 0, reposProcessed: 0, actionsExecuted: 0, summaries: [] };
     }
 
-  let totalCommits = 0;
-  let actionsExecuted = 0;
-  const summaries: { repo: string; summary: string }[] = [];
-
     const MAX_COMMITS_PER_BATCH = 30;
 
     for (const group of groups) {
@@ -559,20 +570,39 @@ export async function analyzeCommitsForOKR(dryRun = false): Promise<AnalyzeResul
       } catch (err) {
         const msg = err instanceof Error ? err.message : String(err);
         console.error(`[AI-OKR] Failed to analyze repo ${group.repoName}: ${msg}`);
+        repoErrors.push({ repo: group.repoName, error: msg });
       }
     }
 
-  // 记录 sync log
+    // 记录 sync log（成功或部分失败）
     const elapsed = Date.now() - startTime;
+    const status = repoErrors.length === groups.length ? 'error' : 'success';
+    const errorSuffix = repoErrors.length > 0
+      ? `; failed repos: ${repoErrors.map(e => `${e.repo}(${e.error})`).join(' | ')}`
+      : '';
     await db.insert(syncLogs).values({
       id: uuid(),
       source: 'ai_okr',
-    status: 'success',
+      status,
-    message: `${dryRun ? '[DRY RUN] ' : ''}Analyzed ${totalCommits} commits from ${groups.length} repos, executed ${actionsExecuted} actions in ${elapsed}ms`,
+      message: `${dryRun ? '[DRY RUN] ' : ''}Analyzed ${totalCommits} commits from ${groups.length} repos, executed ${actionsExecuted} actions in ${elapsed}ms${errorSuffix}`.slice(0, 1000),
       recordsProcessed: actionsExecuted,
       syncedAt: new Date(),
     });
 
     console.info(`[AI-OKR] Completed: ${totalCommits} commits, ${groups.length} repos, ${actionsExecuted} actions in ${elapsed}ms`);
     return { totalCommits, reposProcessed: groups.length, actionsExecuted, summaries };
+  } catch (err) {
+    const msg = err instanceof Error ? `${err.message}\n${err.stack || ''}` : String(err);
+    const elapsed = Date.now() - startTime;
+    console.error(`[AI-OKR] Fatal error: ${msg}`);
+    await db.insert(syncLogs).values({
+      id: uuid(),
+      source: 'ai_okr',
+      status: 'error',
+      message: `${dryRun ? '[DRY RUN] ' : ''}Fatal error after ${elapsed}ms: ${msg}`.slice(0, 1000),
+      recordsProcessed: actionsExecuted,
+      syncedAt: new Date(),
+    });
+    throw err;
+  }
 }