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

scripts/rebuild_spe.ps1

@@ -0,0 +1,54 @@
+# C++ 管线批量重生 CCPD_SPE (24核)
+$ErrorActionPreference = "Continue"
+
+$env:Path = "C:\opencv\build\x64\vc16\bin;$env:Path"
+
+$EXE = "C:\Users\Kirl\Desktop\ICEv2\ICE_Dataset\CCPD_SPE_GEN\cpp_pipeline\build\Release\plate_swap.exe"
+$POOL = "C:\Users\Kirl\Desktop\ICEv2\ICE_Dataset\cpp_pipeline\output\plate_pool"
+$CCPD = "C:\Users\Kirl\Desktop\ICEv2\ICE_Dataset\CCPD\CCPD2019"
+$SPE  = "C:\Users\Kirl\Desktop\ICEv2\ICE_Dataset\CCPD_SPE"
+
+# 清旧
+if (Test-Path $SPE) {
+    Write-Host "删除旧 CCPD_SPE..."
+    Remove-Item -Recurse -Force $SPE
+}
+
+$DIST = @{
+    'ccpd_base'      = 588
+    'ccpd_blur'      = 55
+    'ccpd_challenge' = 159
+    'ccpd_fn'        = 58
+    'ccpd_rotate'    = 30
+    'ccpd_tilt'      = 82
+    'ccpd_weather'   = 28
+}
+
+$TYPES = @('police','army','gangao','shiguan_old','shiguan_new',
+           'lingguan_old','lingguan_new','coach','new_energy')
+
+$total = 0
+$sw = [System.Diagnostics.Stopwatch]::StartNew()
+
+foreach ($type in $TYPES) {
+    Write-Host "`n=== $type ===" -ForegroundColor Cyan
+    foreach ($subdir in $DIST.Keys) {
+        $count = $DIST[$subdir]
+        $ccpdDir = Join-Path $CCPD $subdir
+        $outDir = Join-Path $SPE "$subdir\$type"
+        New-Item -ItemType Directory -Force -Path $outDir | Out-Null
+
+        Write-Host "  $subdir : $count 张... " -NoNewline
+        & $EXE --ccpd-dir $ccpdDir --plate-type $type --plate-pool $POOL `
+               --output $outDir --num $count --workers 24 --seed 42 2>&1 | Out-Null
+        if ($LASTEXITCODE -eq 0) {
+            Write-Host "OK" -ForegroundColor Green
+            $total += $count
+        } else {
+            Write-Host "FAIL" -ForegroundColor Red
+        }
+    }
+}
+
+$sw.Stop()
+Write-Host "`nDONE! $total 张, $([math]::Round($sw.Elapsed.TotalMinutes,1))min" -ForegroundColor Green