feat(core): add POST request support, new sites, migrate to Majestic Million ranking (#2317)

* feat(core): add POST request support, new sites, migrate to Majestic Million ranking
- Added native POST request support to the Maigret engine (requestMethod, requestPayload) to enable querying modern JSON registration endpoints.
- Replaced the discontinued Alexa rank API with the Majestic Million dataset for global popularity sorting and automated CI updates.
- Fixed multiple false positives among top 500 sites and bypassed standard anti-bot protections using custom User-Agents.
- Updated public documentation and internal playbooks to reflect the new features.

* feat(data): apply all data.json site check updates from main branch

- Added CTFtime and PentesterLab (new sites added in main)
- Removed forums.imore.com (deleted in main as dead site)
- Disabled 5 sites per main branch fixes: Librusec, MirTesen, amateurvoyeurforum.com, forums.stevehoffman.tv, vegalab
- Fixed 5 site checks per main branch: SoundCloud, Taplink, Setlist, RoyalCams, club.cnews.ru (switched from status_code to message checkType with proper markers)

Co-authored-by: soxoj <31013580+soxoj@users.noreply.github.com>
Agent-Logs-Url: https://github.com/soxoj/maigret/sessions/a1d194d9-c0ff-4e2b-974c-c5e4b59548bf

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

LLM/site-checks-guide.md

@@ -157,6 +157,7 @@ Summary from an earlier false-positive review for: OpenSea, Mercado Livre, Redtu
 - For **Kaggle**, additionally: **`headers`**, **`errors`** for browser-check text.
 - **Redtube** stayed valid on **`status_code`** with a stable **404** for non-existent users.
 - **Picsart**: the web profile URL is a thin SPA shell; use the **JSON API** (`api.picsart.com/users/show/{username}.json`) in **`url`** with **`message`**-style markers (`"status":"success"` vs `user_not_found`), not the browser-only `/posts` vs `/not-found` navigation.
+- For **Weblate / Anubis Anti-Bot**: Setting `headers` with a basic script User-Agent (e.g. `python-requests/2.25.1`) rather than the default browser UA completely bypassed the Anubis Proof-of-Work challenge HTTP 307 redirect, instantly recovering the native HTTP 404 framework.
 
 ### What required disabling checks