fix(thinking): update ValidateConfig to include fromSuffix parameter and adjust budget validation logic

refactor(thinking): add Gemini family provider grouping for strict validation

refactor(thinking): pass source and target formats to ApplyThinking for cross-format validation

feat(iflow): add iflow-rome model definition

feat(thinking): support zero as a valid thinking budget for capable models

refactor(thinking): simplify ModeNone and budget validation logic

fix(thinking): refine ModeNone handling based on provider capabilities

refactor(thinking): improve budget clamping and logging with provider/model context

feat(logging): order log fields for improved readability

refactor: improve thinking logic