refactor: rename PaddleOCR → PP-OCRv5 in frontend, remove Kombi-Vergleich tab

Since ocr_region_paddle() now runs RapidOCR locally (same PP-OCRv5 models),
the "PaddleOCR (Hetzner)" labels were misleading. Renamed to "PP-OCRv5 (lokal)".
Removed the Kombi-Vergleich tab since both sides would produce identical results.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

admin-lehrer/components/ocr-overlay/PaddleDirectStep.tsx

@@ -30,11 +30,11 @@ export function PaddleDirectStep({
   sessionId,
   onNext,
   endpoint = 'paddle-direct',
-  title = 'Paddle Direct',
-  description = 'PaddleOCR erkennt alle Woerter direkt auf dem Originalbild — ohne Begradigung, Entzerrung oder Zuschnitt.',
+  title = 'PP-OCRv5 Direct',
+  description = 'PP-OCRv5 (lokal via RapidOCR) erkennt alle Woerter direkt auf dem Originalbild — ohne Begradigung, Entzerrung oder Zuschnitt.',
   icon = '⚡',
-  buttonLabel = 'PaddleOCR starten',
-  runningLabel = 'PaddleOCR laeuft...',
+  buttonLabel = 'PP-OCRv5 starten',
+  runningLabel = 'PP-OCRv5 laeuft...',
   engineKey = 'paddle_direct',
 }: PaddleDirectStepProps) {
   const [phase, setPhase] = useState<Phase>('idle')

admin-lehrer/components/ocr-pipeline/StepWordRecognition.tsx

@@ -108,7 +108,7 @@ export function StepWordRecognition({ sessionId, onNext, goToStep, skipHealGaps
     setGridResult(null)
 
     try {
-      // PaddleOCR forces words_first on the backend, so align frontend accordingly
+      // PP-OCRv5 forces words_first on the backend, so align frontend accordingly
       const effectiveGridMethod = eng === 'paddle' ? 'words_first' : gridMethod
       const useStream = effectiveGridMethod === 'v2'
 
@@ -133,7 +133,7 @@ export function StepWordRecognition({ sessionId, onNext, goToStep, skipHealGaps
         throw new Error(err.detail || 'Worterkennung fehlgeschlagen')
       }
 
-      // words_first / paddle returns plain JSON (no streaming)
+      // words_first / pp-ocrv5 returns plain JSON (no streaming)
       if (!useStream) {
         const data = await res.json() as GridResult
         applyGridResult(data)
@@ -820,7 +820,7 @@ export function StepWordRecognition({ sessionId, onNext, goToStep, skipHealGaps
               <option value="auto">Auto (RapidOCR wenn verfuegbar)</option>
               <option value="rapid">RapidOCR (ONNX)</option>
               <option value="tesseract">Tesseract</option>
-              <option value="paddle">PaddleOCR (Hetzner)</option>
+              <option value="paddle">PP-OCRv5 (lokal)</option>
             </select>
 
             {/* Pronunciation selector (only for vocab) */}
@@ -846,13 +846,11 @@ export function StepWordRecognition({ sessionId, onNext, goToStep, skipHealGaps
             {/* Show which engine was used */}
             {usedEngine && (
               <span className={`px-2 py-0.5 rounded text-[10px] uppercase font-semibold ${
-                usedEngine === 'rapid'
+                usedEngine === 'rapid' || usedEngine === 'paddle'
                   ? 'bg-purple-100 dark:bg-purple-900/30 text-purple-700 dark:text-purple-300'
-                  : usedEngine === 'paddle'
-                  ? 'bg-blue-100 dark:bg-blue-900/30 text-blue-700 dark:text-blue-300'
                   : 'bg-gray-100 dark:bg-gray-700 text-gray-600 dark:text-gray-400'
               }`}>
-                {usedEngine}
+                {usedEngine === 'paddle' ? 'pp-ocrv5' : usedEngine}
               </span>
             )}