umputun / tg-spam / 23994194211

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Add Google GenAI spam classification support (#386)

* Add Google GenAI spam classification support

After introducing Gemma 4 model family, with nice (for it's size) multilingual capabilities and generous free quota (1.5K req/day), Google GenAI became a clever choice for even relatively large TG groups.

* fix: change MaxTokensResponse type from int to int32 for compatibility

* feat: refactor LLM provider-specific spam detection logic to avoid code duplication

* feat: add LLM consensus configuration and update documentation

* fix: string formatting (golangci-lint)

* refactor: convert LLM consensus functions to methods

* fix: UTF-8 safe truncation for message requests in Gemini and OpenAI checkers

* fix: update LLM eligibility check for short messages in spam detection

* feat: add request timeout for LLM checks and update context handling

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Co-authored-by: Umputun <umputun@gmail.com>

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