Implement report generation features and UI enhancements

- Added a new API for generating reports, including functions to retrieve report status, agent logs, console logs, and report details.
- Enhanced the Step3Simulation component to manage report generation with loading indicators and improved user feedback during the process.
- Introduced a new Step4Report component to display report details and logs, providing a comprehensive view of the report generation workflow.
- Updated routing to include a dedicated report view, improving navigation and user experience in the application.

frontend/src/api/report.js

@@ -0,0 +1,43 @@
+import service, { requestWithRetry } from './index'
+
+/**
+ * 开始报告生成
+ * @param {Object} data - { simulation_id, force_regenerate? }
+ */
+export const generateReport = (data) => {
+  return requestWithRetry(() => service.post('/api/report/generate', data), 3, 1000)
+}
+
+/**
+ * 获取报告生成状态
+ * @param {string} reportId
+ */
+export const getReportStatus = (reportId) => {
+  return service.get(`/api/report/generate/status`, { params: { report_id: reportId } })
+}
+
+/**
+ * 获取 Agent 日志（增量）
+ * @param {string} reportId
+ * @param {number} fromLine - 从第几行开始获取
+ */
+export const getAgentLog = (reportId, fromLine = 0) => {
+  return service.get(`/api/report/${reportId}/agent-log`, { params: { from_line: fromLine } })
+}
+
+/**
+ * 获取控制台日志（增量）
+ * @param {string} reportId
+ * @param {number} fromLine - 从第几行开始获取
+ */
+export const getConsoleLog = (reportId, fromLine = 0) => {
+  return service.get(`/api/report/${reportId}/console-log`, { params: { from_line: fromLine } })
+}
+
+/**
+ * 获取报告详情
+ * @param {string} reportId
+ */
+export const getReport = (reportId) => {
+  return service.get(`/api/report/${reportId}`)
+}