Add 'Seed Defaults' button to load all predefined translations

- Add /translations/seed-all-defaults API endpoint
- Loads all DEFAULT_TRANSLATIONS (makers, models, colors, fuels, transmissions)
- Includes 100+ predefined translations (Mohave, Sonata, colors, etc.)
- Add 'Seed Defaults' button to admin translations page

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/app/api/translations.py

@@ -637,6 +637,47 @@ def fill_default_translations(db: Session = Depends(get_db)):
     return {"message": f"Updated {updated_count} translations with default values"}
 
 
+@router.post("/seed-all-defaults")
+def seed_all_default_translations(db: Session = Depends(get_db)):
+    """
+    Seed ALL translations from the DEFAULT_TRANSLATIONS dictionary into the database.
+    This pre-populates translations for all known terms, not just those in the cars table.
+    """
+    added_count = 0
+    skipped_count = 0
+
+    for category, terms in DEFAULT_TRANSLATIONS.items():
+        for korean_text, translations in terms.items():
+            # Check if already exists
+            existing = db.query(Translation).filter(
+                Translation.source_text == korean_text,
+                Translation.category == category
+            ).first()
+
+            if existing:
+                skipped_count += 1
+                continue
+
+            trans = Translation(
+                source_text=korean_text,
+                category=category,
+                text_en=translations.get("en", korean_text),
+                text_mn=translations.get("mn", korean_text),
+                text_ru=translations.get("ru", korean_text)
+            )
+            db.add(trans)
+            added_count += 1
+
+    db.commit()
+
+    return {
+        "message": f"Seeded {added_count} translations from default dictionary (skipped {skipped_count} existing)",
+        "added": added_count,
+        "skipped": skipped_count,
+        "categories": list(DEFAULT_TRANSLATIONS.keys())
+    }
+
+
 # AI Auto-Translation Service
 import httpx
 import json

frontend/src/app/admin/translations/page.tsx

@@ -115,6 +115,18 @@ export default function TranslationsPage() {
     }
   };
 
+  const handleSeedAllDefaults = async () => {
+    try {
+      const result = await translationsApi.seedAllDefaults();
+      alert(`${result.message}\n\nCategories: ${result.categories.join(', ')}`);
+      loadTranslations();
+      loadStats();
+    } catch (err) {
+      console.error('Failed to seed defaults:', err);
+      alert('Failed to seed default translations');
+    }
+  };
+
   const handleAutoTranslate = async (translation: Translation) => {
     setTranslatingId(translation.id);
     try {
@@ -217,9 +229,20 @@ export default function TranslationsPage() {
       <div className="flex justify-between items-center mb-6">
         <h1 className="text-2xl font-bold text-gray-800">Translations Management</h1>
         <div className="flex gap-2">
+          <button
+            onClick={handleSeedAllDefaults}
+            className="bg-indigo-600 text-white px-4 py-2 rounded-lg hover:bg-indigo-700 flex items-center gap-2"
+            title="Load all predefined translations (makers, models, colors, fuels, etc.)"
+          >
+            <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 16v1a3 3 0 003 3h10a3 3 0 003-3v-1m-4-8l-4-4m0 0L8 8m4-4v12" />
+            </svg>
+            Seed Defaults
+          </button>
           <button
             onClick={handleAutoExtract}
             className="bg-blue-600 text-white px-4 py-2 rounded-lg hover:bg-blue-700 flex items-center gap-2"
+            title="Extract terms from cars in database"
           >
             <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
               <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15" />

frontend/src/lib/api.ts

@@ -294,6 +294,11 @@ export const translationsApi = {
     return data;
   },
 
+  seedAllDefaults: async (): Promise<{ message: string; added: number; skipped: number; categories: string[] }> => {
+    const { data } = await api.post('/translations/seed-all-defaults');
+    return data;
+  },
+
   bulkLookup: async (texts: string[], lang: string, category?: string): Promise<{ translations: Record<string, string> }> => {
     const { data } = await api.post('/translations/bulk-lookup', {
       texts,