Update model card: 3-branch, branch terminology, 5-class comparison + ablations + session model

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Branch1 5-class comparison: CNN + SQL-keyword-aware char tokenizer

Branch1 5-class comparison: DistilBERT fine-tune (distilbert-base-uncased)

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Nhanh 2: One-Class SVM, AUC=0.90, FPR=0.3%, detection_rate=20.7%

Nhanh 1: TF-IDF+LogReg, F1-macro=0.9822

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