feat(data): 扩展示例波形数据与测试覆盖

新增示例谐波对比数据，完善图例、多轴和演示测试，并同步文档说明。

src/data/simulatedWaveforms.test.ts

@@ -3,7 +3,7 @@ import { describe, expect, it } from 'vitest'
 import { createSimulatedWaveformData } from './simulatedWaveforms'
 
 describe('simulated waveform data', () => {
-  it('creates deterministic, finite six-channel data', () => {
+  it('creates deterministic, finite seven-channel data with a two-series second frame', () => {
     const first = createSimulatedWaveformData()
     const second = createSimulatedWaveformData()
 
@@ -11,8 +11,12 @@ describe('simulated waveform data', () => {
     expect(first.kind).toBe('series')
     if (first.kind !== 'series') return
 
-    expect(first.series).toHaveLength(6)
-    expect(new Set(first.series.map((series) => series.id)).size).toBe(6)
+    expect(first.series).toHaveLength(7)
+    expect(new Set(first.series.map((series) => series.id)).size).toBe(7)
+    const secondFrame = first.series.filter(
+      (series) => series.trackId === 'simulated-harmonic-frame',
+    )
+    expect(secondFrame).toHaveLength(2)
     expect(new Set(first.series.map((series) => series.shotNo))).toEqual(new Set(['13300']))
     first.series.forEach((series) => {
       expect(series.data.kind).toBe('points')