docs: update providers documentation and enhance support for Blackbox HAR auth

- Added "No auth / HAR file" authentication type in providers-and-models.md
- Added "Video generation" column to provider tables for future capability
- Updated model counts and provider capabilities throughout documentation
- Fixed ARTA provider with improved error handling and response validation
- Enhanced AllenAI provider with vision model support and proper image handling
- Significantly improved Blackbox provider:
  - Added HAR file authentication support
  - Added subscription status checking
  - Added premium/demo model differentiation
  - Improved session handling and error recovery
- Enhanced DDG provider with better error handling for challenges
- Improved PollinationsAI and PollinationsImage providers' model handling
- Added VideoModel class in g4f/models.py
- Added audio/video generation indicators in GUI components
- Added new Ai2 models: olmo-1-7b, olmo-2-32b, olmo-4-synthetic
- Added new commit message generation tool in etc/tool/commit.py

g4f/gui/server/backend_api.py

@@ -99,6 +99,8 @@ class Backend_Api(Api):
                 "name": model.name,
                 "image": isinstance(model, models.ImageModel),
                 "vision": isinstance(model, models.VisionModel),
+                "audio": isinstance(model, models.AudioModel),
+                "video": isinstance(model, models.VideoModel),
                 "providers": [
                     getattr(provider, "parent", provider.__name__)
                     for provider in providers