Too few keywords cause podcast searches to fail (especially in Chinese)

### Description

I found that when searching for episodes within the podcast, too few characters will render the search ineffective.
I tested it, and it seems that the search only works properly when there are 3 or more characters. If there are 2 or 1 character, the search does not work.
This may not affect English or other languages, but it causes some issues in Chinese.

**Since common phrases and keywords in Chinese are often 1 or 2 characters long, and one Chinese character typically corresponds to one English word, this results in the internal search function frequently failing when using Chinese.**

I hope this can be improved to make it more convenient and user-friendly for Chinese users. Thank you!

### Screenshots or screen recording

| 2 Words No Work | 3 Words Can Work |
| --- | --- |
| | |
| | |

### Did you search for existing list?

- [x] I have searched for existing issues.

No files or tests are named in the issue. Reproduce podcast searches using one- and two-character Chinese keywords, then locate the podcast search entry point and its minimum-query handling. Done means one- and two-character Chinese searches return effective results without regressing longer searches.

Written by the indexing model from the issue text.