Normalize Reddit subreddit names before rendering

[LittleChenLiya]

Summary

This fixes a Reddit formatting bug where subreddit values can show up as object/dict strings in the rendered output instead of clean subreddit names.

For example, instead of rendering something like r/openclaw, the output could render r/{'id': 't5_...', 'name': 'openclaw', ...} when the upstream Reddit result returned a structured subreddit object.

What changed

• Normalize Reddit subreddit values to a clean subreddit name before rendering
• Handle both string and dict/object-shaped subreddit values
• Apply the normalization across the Reddit search/parse/normalize path so downstream rendering and entity extraction stay consistent

Why

Issue #100 mentions cases where subreddit names are rendered incorrectly in the output. This PR fixes that user-visible formatting bug directly.

[LittleChenLiya]

Hi @mvanhorn,
Sorry to disturb you.
I was just wondering if you might have time to take a quick look at this PR when you're available.
No rush at all. Thank you very much!

[mvanhorn]

Hey @LittleChenLiya, sorry for the delayed response - I see you've been busy and I appreciate the polite ping. The subreddit normalization here, the YouTube auto-caption warnings in #107, and the Windows timeout issue you flagged in #110 are all good catches.

I want to be upfront - we're deep in a v3.0 refactor that's rewriting most of the pipeline these PRs touch. I can't commit to merging any of these right now because the merge conflicts are going to be significant once 3.0 lands. I promise I'll come back and consider each one in the context of the new architecture.

It's been a crazy few days - we hit #1 trending on GitHub for three straight days, which is why there's such a wave of contributions and such a backlog. I really appreciate your patience and the quality of your work. Will be back once 3.0 settles.

[LittleChenLiya]

嘿，抱歉回复晚了——我看到你最近很忙，也很感谢你的礼貌回复。这里的子版块规范化、#107 里的 YouTube 自动字幕警告，以及你在 #110 标记的 Windows 超时问题，都是很好的发现。

我想坦白说——我们正深入进行v3.0重构，正在重写这些PR接触的大部分流程。我现在还不能决定合并这些，因为3.0上线后合并冲突会很严重。我保证以后会在新架构的背景下仔细考虑每一个。

这几天真是疯狂——我们在GitHub上连续三天进入#1热搜，这也是为什么贡献浪潮涌现，积压了这么多。我非常感谢你的耐心和作品质量。等3.0稳定后我会回来。

@mvanhorn 好呀！也许等你们3.0版本上线以后，我还可以基于新版本重写这部分内容——我很乐意