BlogGen Connector v1.1.18 — Strip Visible Meta Description

Fixes client posts showing text such as "Meta description:" in the visible article/excerpt.

Changes:
- Removes visible metadata labels from post content before publishing.
- Strips common labels including Meta description, SEO title, SEO description, Focus keyphrase and Slug.
- Removes the "Meta description:" prefix from excerpts/summaries.
- Keeps v1.1.17 client-side 200 KB image compression.
