feat: Dashboard数据关联修复 + 通知模板优化 + 工单创建页布局

1. Dashboard: stats新增queryStats查询统计, trend API真实工单趋势数据
2. Layout铃铛: 显示真实待审批工单数量
3. 通知模板优化:
   - 创建工单通知: 含申请人+目标实例+库+SQL摘要
   - 审批通过/拒绝通知: 含审批人+目标实例
   - 执行完成/失败通知: 含执行人+目标实例+库
4. 飞书卡片颜色: 创建=turquoise, 审批=blue, 成功=green, 失败=red
5. 钉钉消息: 添加状态emoji标签(🆕✅❌⚠️)
6. TicketCreatePage: 底部操作栏(SQL检测+提交审批)
7. ticket_executor: 移除aiomysql不支持的read_timeout/write_timeout

Tests: 1057 passed, 17 pre-existing failures (notification 35/35 passed)

frontend/src/pages/Dashboard.tsx

@@ -43,24 +43,9 @@ const priorityStyle: Record<PriorityKey, { border: string; bg: string; icon: Rea
 const priorityLabel: Record<PriorityKey, string> = { urgent: '紧急', high: '重要', normal: '通知', low: '一般' };
 
 const trendDatasets: Record<TrendRange, TrendDataset> = {
-  7: {
-    xAxis: ['周一', '周二', '周三', '周四', '周五', '周六', '周日'],
-    submitted: [120, 132, 101, 134, 90, 230, 210],
-    success: [110, 125, 95, 128, 85, 215, 200],
-    failed: [5, 3, 4, 2, 3, 8, 5],
-  },
-  30: {
-    xAxis: Array.from({ length: 15 }, (_, i) => `${i * 2 + 1}日`),
-    submitted: [85, 92, 78, 105, 120, 95, 88, 110, 125, 140, 95, 82, 115, 130, 145],
-    success: [80, 88, 75, 98, 112, 90, 85, 105, 118, 132, 90, 78, 108, 125, 138],
-    failed: [3, 2, 2, 5, 4, 3, 2, 3, 4, 5, 3, 2, 4, 3, 4],
-  },
-  90: {
-    xAxis: Array.from({ length: 12 }, (_, i) => `${i * 7 + 1}日`),
-    submitted: [520, 480, 610, 590, 720, 680, 750, 800, 720, 650, 580, 620],
-    success: [490, 455, 580, 560, 685, 650, 720, 770, 695, 625, 555, 598],
-    failed: [18, 15, 22, 20, 25, 18, 20, 22, 18, 16, 14, 15],
-  },
+  7: { xAxis: [], submitted: [], success: [], failed: [] },
+  30: { xAxis: [], submitted: [], success: [], failed: [] },
+  90: { xAxis: [], submitted: [], success: [], failed: [] },
 };
 
 /* ------------------------------------------------------------------ */
@@ -140,6 +125,7 @@ export default function Dashboard() {
   const [dbInstances, setDbInstances] = useState<any[]>([]);
   const [tickets, setTickets] = useState<any[]>([]);
   const [queryStats, setQueryStats] = useState<any>(null);
+  const [trendData, setTrendData] = useState<TrendDataset>({ xAxis: [], submitted: [], success: [], failed: [] });
 
   useEffect(() => {
     import('@/api/request').then(m => m.default.get('/announcements')).then(res => {
@@ -160,11 +146,30 @@ export default function Dashboard() {
   /* ---- Data Fetch ---- */
   useEffect(() => {
     dashboardApi.getStats()
-      .then(data => setStats(data))
+      .then(data => {
+        setStats(data);
+        // 关联查询统计
+        if (data.query_stats) setQueryStats(data.query_stats);
+      })
       .catch(() => setStats(null))
       .finally(() => setLoading(false));
   }, []);
 
+  /* ---- Trend Data ---- */
+  useEffect(() => {
+    import('@/api/request').then(m => m.default.get('/dashboard/trend', { params: { days: trendRange } }))
+      .then((res: any) => {
+        const items = res?.items || res?.data?.items || [];
+        setTrendData({
+          xAxis: items.map((p: any) => p.date),
+          submitted: items.map((p: any) => p.submitted),
+          success: items.map((p: any) => p.success),
+          failed: items.map((p: any) => p.failed),
+        });
+      })
+      .catch(() => setTrendData({ xAxis: [], submitted: [], success: [], failed: [] }));
+  }, [trendRange]);
+
   /* ---- Instances & Tickets ---- */
   useEffect(() => {
     import('@/api/request').then(m => {
@@ -225,7 +230,7 @@ export default function Dashboard() {
       ? { bg: 'rgba(255,255,255,0.95)', border: '#e2e5eb', text: '#1a1d23', muted: '#5c6370', grid: '#f0f1f5', blue: '#2563eb', green: '#16a34a', red: '#dc2626' }
       : { bg: 'rgba(22, 27, 34, 0.95)', border: '#30363d', text: '#f0f6fc', muted: '#8b949e', grid: '#21262d', blue: '#58a6ff', green: '#3fb950', red: '#f85149' };
 
-    const dataset = trendDatasets[trendRange];
+    const dataset = trendData;
 
     const option: echarts.EChartsOption = {
       backgroundColor: 'transparent',
@@ -297,7 +302,7 @@ export default function Dashboard() {
     const handleResize = () => chart.resize();
     window.addEventListener('resize', handleResize);
     return () => { window.removeEventListener('resize', handleResize); };
-  }, [theme, trendRange]);
+  }, [theme, trendRange, trendData]);
 
   useEffect(() => {
     return () => { chartInstanceRef.current?.dispose(); };