Remove stale pre-rename folder nhanh1_v1 (dup of branch*_v1)

nhanh1_v1/metadata.json

@@ -1,24 +0,0 @@
-{
-  "version": "nhanh1_v1",
-  "branch": "nhanh1_supervised_multiclass",
-  "architecture": "tfidf_logreg",
-  "trained_at": "2026-07-16T12:16:08",
-  "train_rows": 54236,
-  "test_rows": 13560,
-  "f1_macro": 0.9821905121114611,
-  "train_time_s": 14.00293961600255,
-  "labels": {
-    "0": "normal",
-    "1": "union_based",
-    "2": "error_based",
-    "3": "boolean_blind",
-    "4": "time_blind"
-  },
-  "dataset": "data/processed/nhanh1_train.csv",
-  "tfidf": {
-    "analyzer": "char_wb",
-    "ngram_min": 2,
-    "ngram_max": 4,
-    "max_features": 50000
-  }
-}

nhanh1_v1/model.joblib

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:033baac14b25eefa63c81189aec21b08b9c579545ec2ae5bed2170cf7aafe404
-size 2000943

nhanh1_v1/vectorizer.joblib

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:f210844f1d49f9c0042c71ded78287f3522480166ab9496cfdbcf9879d453144
-size 1680347