[leakgallery] add support (#7872)

* add new extractor for leakgallery.com

    Added support for downloading photo and video posts from leakgallery.com.

    Supports:
    * Individual post URLs
    * User profile URLs with pagination via AJAX
    * Optional type/sort filters (e.g. /Photos/MostRecent)
    * Proper file extension handling
    * Creator-based folder structure
    * Compatibility with --download-archive

    Tested locally and functional, but may still need review or improvement.
    
* [leakgallery] add support
    Added leakgallery to extractor module imports so it's recognized and used.
* [leakgallery] update extractor structure
    - Refactored using LeakGalleryExtractorBase to remove duplication
    - Moved init logic into items() using self.groups
    - Replaced re with text.re as per upstream guidance
    - Added creator fallback and media deduplication
    - Aligned structure with gallery-dl maintainer review tips
* [leakgallery] add support
    - Added leakgallery entry to supportedsites.md
    - Includes post, user, trending, and most-liked subcategories
* add exported extractor results
* [leakgallery] fix flake8 style issues
    Cleaned up code to comply with flake8 rules, especially:
    - removed unused imports
    - split long lines >79 chars
    - ensured newline at EOF
    No functional changes made; purely formatting to satisfy CI checks.
* [tests] update extractor results
* [leakgallery] fix flake8 style issues (part 2)
    Fix remaining flake8 issues in leakgallery.py:
    - Reformat line breaks to avoid W503 (line break before binary operator)
    - Wrap long lines to respect E501 (line too long > 79 characters)
    - Cleaned up exception logging for better clarity
    - Confirmed all flake8 checks now pass successfully
    This superseedes the previous commit which partially fixed formatting violations.
* [leakgallery] fix flake8 style issues (part 3)
* [leakgallery] rename extractor classes
* [tests] update extractor results
* [tests] rename extractor results
* [leakgallery] rename extractor classes (part 2)
* [leakgallery] rename example
* update docs/supportedsites
* update test results
    and convert line endings to '\n'
* update
    - convert line endings to '\n'
    - use _pagination method
    - fix logging calls
* return more metadata for _pagination() results

scripts/supportedsites.py

@@ -91,6 +91,7 @@ CATEGORY_MAP = {
     "jpgfish"        : "JPG Fish",
     "kabeuchi"       : "かべうち",
     "schalenetwork"  : "Schale Network",
+    "leakgallery"    : "Leak Gallery",
     "livedoor"       : "livedoor Blog",
     "lofter"         : "LOFTER",
     "ohpolly"        : "Oh Polly",
@@ -298,6 +299,10 @@ SUBCATEGORY_MAP = {
         "discord-server": "",
         "posts"         : "",
     },
+    "leakgallery": {
+        "trending" : "Trending Medias",
+        "mostliked": "Most Liked Posts",
+    },
     "lensdump": {
         "albums": "",
     },