[feature] LLM Summary between differences

[dgtlmoon]

if i ask ChatGPT I get these nice summaries instead of a blob of red/green text

🟩 Summary

Major update to Allegro’s privacy policy, filters, and product listings:

Privacy text modernized (GDPR-compliant wording).

Search and category UI expanded.

Results doubled from 2 → 4.

Filter system completely overhauled with new categories and price ranges.

Added new localization options and “Allegro Group services” footer.

We could cache these outputs in the db as chatgpt-123213123-vs-12321312.txt

We can send just the change, or change plus few lines of context, or unix patch diff to openai/chatgpt/etc to cut down on tokens used/limits