Add AI Fast Club to Tools

[KKWANG4444]

Adds AI Fast Club to the Tools section.\n\nAI Fast Club is an OpenAI-compatible API gateway supporting the /v1/chat/completions endpoint and providing access to 500+ global and Chinese models. Users create an AI Fast Club platform API key; this is not an OpenAI provider key. Alipay and WeChat payments are supported.\n\nThis PR changes one file and adds one entry following the existing format.

[gemini-code-assist]

Code Review

This pull request adds 'AI Fast Club' to the list of resources in the README.md. The review feedback correctly points out that the description references non-existent model versions (such as Claude Opus 4.8 and GPT-5.6) and suggests using general model family names instead to maintain accuracy.

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[KKWANG4444]

Friendly follow-up: this entry uses the current domain https://www.aifast.hk and keeps claims general to avoid stale model/version details. The PR remains mergeable; happy to adjust formatting or placement to match the list.