feat: Add AtlasCloud model integration

[YC0101]

Fixes #3682

Description

• Add AtlasCloudModel class inheriting from OpenAICompatibleModel
• Add AtlasCloudConfig for model configuration
• Register AtlasCloud in ModelFactory and ModelPlatformType
• Add two basic model types: ATLASCLOUD_GPT_OSS_120B and ATLASCLOUD_GLM_4_7
• Support string model names for all AtlasCloud models
• Add is_atlascloud property to unified_model_type
• Configure token limits (64,000 tokens) for AtlasCloud models
• Add example code and unit tests
• Update documentation with AtlasCloud usage guide

This integration allows users to access all AtlasCloud models via:

• Predefined enum types (ATLASCLOUD_GPT_OSS_120B, ATLASCLOUD_GLM_4_7)
• String model names for any AtlasCloud model (e.g., 'minimaxai/minimax-m2.1')

API endpoint: https://api.atlascloud.ai/v1
Environment variable: ATLASCLOUD_API_KEY

Checklist

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• I have updated the tests accordingly (required for a bug fix or a new feature)
• I have updated the documentation if needed:
• I have added examples if this is a new feature

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[fengju0213]

thanks for your contribution！and sorry for late reply

[fengju0213]

great work! @YC0101 just submit some minor update to this pr directlt since it's a pr from fork repo

[waleedalzarooni]

Great job @YC0101,

One quick tweak otherwise looks great!

[waleedalzarooni]

missing method definition
@property def is_atlascloud(self) -> bool: r"""Returns whether this type of models is served by AtlasCloud.""" return self in { ModelType.ATLASCLOUD_GPT_OSS_120B, ModelType.ATLASCLOUD_GLM_4_7, }
without this is_atlascloud returns true for every model
e.g. ModelType.GPT_40.is_atlascloud would return True when it is False

[Wendong-Fan]

thanks @YC0101 , @fengju0213 @waleedalzarooni , i will do enhance in another pr