Update dpa_adapt scripts and docs

Author: zhaiwenxi

doc/dpa_adapt/README.md

@@ -33,7 +33,7 @@ model = DPAFineTuner(
     predictor="rf",  # "rf" | "linear" | "mlp"
     pooling="mean",  # "mean" | "sum" | "mean+std" | "mean+std+max+min"
 )
-model.fit(train_data="/data/train", target_key="homo")
+model.fit(train_data="/data/train/*", target_key="homo")
 
 # frozen_head / finetune — same interface, different depth
 model = DPAFineTuner(

examples/dpa_adapt/scripts/prepare_data.py

@@ -31,8 +31,6 @@
 
 import numpy as np
 
-sys.path.insert(0, str(Path(__file__).resolve().parents[3]))
-
 from dpa_adapt import (
     convert,
 )

examples/dpa_adapt/scripts/run_evaluate.py

@@ -7,9 +7,6 @@
     Path,
 )
 
-# Ensure repo root is on sys.path so `dpa_adapt` is importable
-sys.path.insert(0, str(Path(__file__).resolve().parent.parent.parent.parent))
-
 import numpy as np
 
 from dpa_adapt import (