Dataset: add READMEs, organize scripts, update .gitignore

- Add README.md to all 16 dataset directories with script references
- Centralize generation scripts under scripts/ with full README
- Update .gitignore to cover all data directories, keep only metadata
- Remove redundant CCPD/.gitignore (parent covers same rules)
- Remove stale scripts/test/ (254MB pipeline residue)
- Fix label parser reference: scripts are authoritative source of truth

.gitignore

@@ -1,32 +1,100 @@
+# ============================================================
 # Python
+# ============================================================
 __pycache__/
 *.py[cod]
 
+# ============================================================
 # IDE / Editor
+# ============================================================
 .vscode/
 .idea/
 *.swp
 *.swo
 *~
 
+# ============================================================
 # OS
+# ============================================================
 .DS_Store
 Thumbs.db
 Desktop.ini
 
-# Logs
+# ============================================================
+# Logs & Cache
+# ============================================================
 *.log
-
-# Jupyter
 .ipynb_checkpoints/
 
-ccpd_combined_5k5k_spe/
-output/
-CCPD_SPE/*/
-
-build/
-
-# CCPD raw data (keep on disk, never commit)
+# ============================================================
+# CCPD 原始真图 (~353K, ~23GB)
+# ============================================================
 CCPD/CCPD2019/
 CCPD/CCPD2020/
-CCPD/*.7z
+CCPD/*.7z
+CCPD/*.zip
+
+# ============================================================
+# CCPD 真图 TRANS (~297K, ~2GB)
+# ============================================================
+CCPD_REAL_TRANS/train/*.jpg
+
+# ============================================================
+# CCPD 322K 合成管线
+# ============================================================
+CCPD_322K/train/
+CCPD_322K/test/
+CCPD_322K_EXP_CUT/train/
+CCPD_322K_EXP_CUT/test/
+CCPD_322K_EXP_CUT_TRANS/train/
+CCPD_322K_EXP_CUT_TRANS/test/
+
+# ============================================================
+# CCPD 19K 合成管线 (YOLO / CAT / COR)
+# ============================================================
+CCPD_19K/train/
+CCPD_19K/test/
+CCPD_19K_EXP_CUT/train/
+CCPD_19K_EXP_CUT/test/
+CCPD_19K_EXP_CUT_TRANS/train/
+CCPD_19K_EXP_CUT_TRANS/test/
+
+# ============================================================
+# CCPD Random 蓝绿
+# ============================================================
+CCPD_Random_Blue5K_Green5K/blue/
+CCPD_Random_Blue5K_Green5K/green/
+CCPD_Random_Blue5K_Green5K_EXP_CUT/blue/
+CCPD_Random_Blue5K_Green5K_EXP_CUT/green/
+CCPD_Random_Blue5K_Green5K_EXP_CUT_TRANS/blue/
+CCPD_Random_Blue5K_Green5K_EXP_CUT_TRANS/green/
+CCPD_Random_Blue150K_Green100K/blue/
+CCPD_Random_Blue150K_Green100K/green/
+
+# ============================================================
+# CCPD SPE 特殊车牌
+# ============================================================
+CCPD_SPE/army/
+CCPD_SPE/coach/
+CCPD_SPE/gangao/
+CCPD_SPE/lingguan_new/
+CCPD_SPE/lingguan_old/
+CCPD_SPE/new_energy/
+CCPD_SPE/police/
+CCPD_SPE/shiguan_new/
+CCPD_SPE/shiguan_old/
+CCPD_SPE/ccpd_base/
+
+# ============================================================
+# CBLPRD
+# ============================================================
+CBLPRD_TRANS/train/*.jpg
+CBLPRD_eval/
+
+# ============================================================
+# 其他
+# ============================================================
+ccpd_combined_5k5k_spe/images/
+ccpd_combined_5k5k_spe/labels/
+output/
+build/