feat: overhaul Logs page with search, container logs, statistics, and rotation

- Added 4-tab layout: Service Logs, Container Logs, Statistics & Rotation, Health History
- Service Logs: service/level/line-count selector, keyword search, auto-refresh (5s)
- Container Logs: container picker, tail lines selector, auto-refresh
- Statistics & Rotation: per-service file size, entry/error/warning counts, per-service and bulk rotate buttons
- Added logsAPI in api.js: getServiceLogs, searchLogs, exportLogs, getStatistics, rotateLogs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

webui/src/services/api.js

@@ -186,6 +186,17 @@ export const monitoringAPI = {
   getHealthHistory: () => api.get('/api/health/history'),
 };
 
+// Logs API
+export const logsAPI = {
+  getServiceLogs: (service, level = 'ALL', lines = 100) =>
+    api.get(`/api/logs/services/${service}`, { params: { level, lines } }),
+  searchLogs: (data) => api.post('/api/logs/search', data),
+  exportLogs: (data) => api.post('/api/logs/export', data),
+  getStatistics: (service) =>
+    api.get('/api/logs/statistics', service ? { params: { service } } : {}),
+  rotateLogs: (service) => api.post('/api/logs/rotate', service ? { service } : {}),
+};
+
 // Container Management API
 export const containerAPI = {
   // Containers