[Bug] Duplicate Type Declaration Files Causing Compatibility Issues in ECharts Dist

### Version

5.6.0

### Link to Minimal Reproduction

https://codesandbox.io/p/devbox/serene-shape-forked-9fdkkm?file=%2Fsrc%2FChartOptions.tsx%3A16%2C1&workspaceId=ws_Cu6yPpuirbVPUqy9GZp5AL

### Steps to Reproduce

Check for type errors in the options within src/ChartOptions.tsx

### Current Behavior

TypeScript throws compatibility errors due to duplicate/conflicting type declarations from these two files. This is caused by TypeScript's type compatibility rules for private/protected members ([TS Handbook Reference](https://www.typescriptlang.org/docs/handbook/type-compatibility.html#private-and-protected-members-in-classes)).

### Expected Behavior

1. Merge or partial consolidation of the type declaration files (echart.d.ts and shared.d.ts) to eliminate compatibility conflicts

2. Official documentation clarifying the proper usage pattern for these type definitions

3. An official fix in future ECharts releases if this is confirmed as a packaging issue

### Environment

```markdown
N/A
```

### Any additional comments?

Related discussion: https://github.com/hustcc/echarts-for-react/issues/589#issuecomment-2729226787