feat: Implement daily attendance tracking system

- Backend: Auto-sync work reports with attendance records
- Backend: Lazy initialization of daily active worker records
- Frontend: Real-time attendance status on Group Leader Dashboard

web-ui/css/modern-dashboard.css

@@ -1896,3 +1896,99 @@
     font-size: 0.75rem;
   }
 }
+
+/* ========== 근태 현황 그리드 (Added dynamically) ========== */
+.status-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
+  gap: 1rem;
+  padding: 1rem;
+}
+
+.worker-card {
+  background: white;
+  border-radius: 0.75rem;
+  padding: 1rem;
+  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
+  border: 1px solid #e2e8f0;
+  display: flex;
+  flex-direction: column;
+  gap: 0.75rem;
+  position: relative;
+  overflow: hidden;
+  transition: all 0.2s ease;
+}
+
+.worker-card:hover {
+  transform: translateY(-2px);
+  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
+}
+
+.worker-card.status-alert {
+  background-color: #fef2f2;
+}
+
+.worker-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  margin-bottom: 0;
+}
+
+.worker-name {
+  font-weight: 600;
+  color: #1f2937;
+  font-size: 1rem;
+}
+
+.worker-job {
+  font-size: 0.75rem;
+  color: #6b7280;
+  background: #f3f4f6;
+  padding: 2px 6px;
+  border-radius: 4px;
+}
+
+.worker-body {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+}
+
+.status-badge {
+  font-size: 0.8rem;
+  padding: 4px 8px;
+  border-radius: 6px;
+  font-weight: 500;
+  display: flex;
+  align-items: center;
+  gap: 4px;
+}
+
+.work-hours {
+  font-weight: 600;
+  font-size: 0.9rem;
+  color: #374151;
+}
+
+.worker-footer {
+  margin-top: auto;
+  padding-top: 0.5rem;
+  border-top: 1px dashed #e5e7eb;
+}
+
+.alert-text {
+  color: #ef4444;
+  font-size: 0.75rem;
+  font-weight: 600;
+  display: flex;
+  align-items: center;
+  gap: 0.25rem;
+}
+
+.empty-state {
+  text-align: center;
+  padding: 3rem;
+  color: #6b7280;
+  width: 100%;
+}