关于sentinel热点规则的规则数量问题

## Issue Description

Question
### Describe what happened (or what feature you want)

### Describe what you expected to happen

### How to reproduce it (as minimally and precisely as possible)

1. 热点规则的数量有上限吗？过多的热点规则会带来一些问题吗（1000+热点规则）

### Tell us your environment

### Anything else we need to know?

No files, tests, entry points, environment, or concrete failure are provided. Start by locating Sentinel's hotspot-rule implementation and related tests, then determine whether 1000+ rules have a defined limit or documented impact; done means an evidence-based answer or a clearly scoped change request.

Written by the indexing model from the issue text.