[fitnakedgirls] add support (#8671)

* [fitnakedgirls] add extractor

Add support for fitnakedgirls.com:
- Photo galleries (/photos/gallery/)
- Category pages (/photos/gallery/category/)
- Tag pages (/photos/tag/)
- Video posts (/videos/)
- Blog posts (/fitblog/)

Handles both newer (wp-block-image) and older (size-large) templates.

* simplify & fix

- use '_extract_title' method
- move '_pagination' into base class
- update 'FitnakedgirlsTagExtractor' pattern

* update docs/supportedsites

---------

Co-authored-by: Mike Fährmann <mike_faehrmann@web.de>

test/results/fitnakedgirls.py

@@ -0,0 +1,81 @@
+# -*- coding: utf-8 -*-
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+
+from gallery_dl.extractor import fitnakedgirls
+
+
+__tests__ = (
+{
+    "#url"     : "https://fitnakedgirls.com/photos/gallery/sparksgowild-nude/",
+    "#comment" : "newer template with wp-block-image figures",
+    "#category": ("", "fitnakedgirls", "gallery"),
+    "#class"   : fitnakedgirls.FitnakedgirlsGalleryExtractor,
+    "#pattern" : r"https://fitnakedgirls\.com/photos/wp-content/uploads/\d+/\d+/.+\.(jpg|mp4)",
+    "#count"   : range(60, 70),
+
+    "gallery_id"  : 419511,
+    "gallery_slug": "sparksgowild-nude",
+    "model"       : "SparksGoWild",
+    "title"       : "SparksGoWild",
+},
+
+{
+    "#url"     : "https://fitnakedgirls.com/photos/gallery/mikayla-demaiter-mikayla_demaiter-nude-8-photos-2/",
+    "#comment" : "older template with size-large img tags",
+    "#category": ("", "fitnakedgirls", "gallery"),
+    "#class"   : fitnakedgirls.FitnakedgirlsGalleryExtractor,
+    "#pattern" : r"https://fitnakedgirls\.com/photos/wp-content/uploads/\d+/\d+/.+\.jpg",
+    "#count"   : 8,
+
+    "gallery_id"  : 329550,
+    "gallery_slug": "mikayla-demaiter-mikayla_demaiter-nude-8-photos-2",
+    "model"       : "Mikayla Demaiter (mikayla_demaiter)",
+    "title"       : "Mikayla Demaiter (mikayla_demaiter)",
+},
+
+{
+    "#url"     : "https://fitnakedgirls.com/photos/gallery/category/fit-naked-girls/",
+    "#category": ("", "fitnakedgirls", "category"),
+    "#class"   : fitnakedgirls.FitnakedgirlsCategoryExtractor,
+    "#pattern" : fitnakedgirls.FitnakedgirlsGalleryExtractor.pattern,
+    "#range"   : "1-10",
+    "#count"   : 10,
+},
+
+{
+    "#url"     : "https://fitnakedgirls.com/photos/gallery/tag/blonde/",
+    "#category": ("", "fitnakedgirls", "tag"),
+    "#class"   : fitnakedgirls.FitnakedgirlsTagExtractor,
+    "#pattern" : fitnakedgirls.FitnakedgirlsGalleryExtractor.pattern,
+    "#range"   : "1-10",
+    "#count"   : 10,
+},
+
+{
+    "#url"     : "https://fitnakedgirls.com/videos/2025/08/arikytsya-gym-sybian-riding-ppv-video/",
+    "#category": ("", "fitnakedgirls", "video"),
+    "#class"   : fitnakedgirls.FitnakedgirlsVideoExtractor,
+    "#pattern" : r"https://fitnakedgirls\.com/videos/wp-content/uploads/.+\.mp4",
+    "#count"   : 1,
+
+    "video_id": 456559,
+    "slug"    : "arikytsya-gym-sybian-riding-ppv-video",
+    "title"   : "Arikytsya Gym Sybian Riding PPV Video",
+},
+
+{
+    "#url"     : "https://fitnakedgirls.com/fitblog/haven-schulz-2/",
+    "#category": ("", "fitnakedgirls", "blog"),
+    "#class"   : fitnakedgirls.FitnakedgirlsBlogExtractor,
+    "#pattern" : r"https://fitnakedgirls\.com/fitblog/wp-content/uploads/.+\.(jpg|png)",
+    "#count"   : 10,
+
+    "post_id": 165409,
+    "slug"   : "haven-schulz-2",
+    "title"  : "Haven Schulz",
+},
+
+)