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### What problem does this PR solve? Closes #15167. The Baidu Go provider advertises OCR support through `paddleocr-vl-0.9b`, but `BaiduModel.OCRFile` dereferenced required inputs before validating them. Calling OCR with a missing API config, API key, or model name could panic instead of returning a normal error. This PR adds explicit input validation for those required values. ### Type of change - [x] Bug Fix (non-breaking change which fixes an issue) --------- Co-authored-by: Jin Hai <haijin.chn@gmail.com>