Add German publisher T-Online

[freylily]

Implements the T-Online publisher with body content extraction.

Changes:

• Created TOnlineParser class with V1 parser version
• Implemented body extraction using CSS selectors for paragraphs, summary, and
  subheadings
• Registered T-Online in the DE publisher group
• Tested selectors on multiple articles to ensure correct extraction

The parser extracts:

• Title from JSON-LD headline
• Authors from JSON-LD author field
• Publishing date from JSON-LD datePublished
• Body content (paragraphs and subheadings)

[addie9800]

Thanks for adding T-Online. Unfortunately, it did not run on my device. I left a couple of comments pointing out the issues.

[addie9800]

This Sitemap does not work. Use RSSFeeds from here instead: https://www.t-online.de/id_15610510/nachrichten-aus-aller-welt-dank-rss-feeds-von-t-online-de-immer-auf-dem-laufenden.html

[addie9800]

You are missing the images and topics attributes.

[addie9800]

You need to rework all the selectors, they do not seem to work.

[addie9800]

As soon as you're done implementing this parser, please follow these steps to generate the test files. Make sure that the test article includes, topics, images and subheadlines.