Add food tag remap feature and show menu tags in restaurant cards

- LLM extraction prompt: foods_mentioned max 10, Korean only, prioritized
- New /remap-foods API endpoint for bulk LLM re-extraction
- Admin UI: "메뉴태그 재생성" button with SSE progress bar
- Backend: attach foods_mentioned to restaurant list API response
- Restaurant cards: display food tags (orange, max 5 visible)

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

frontend/src/components/RestaurantList.tsx

@@ -63,8 +63,23 @@ export default function RestaurantList({
           {r.region && (
             <p className="mt-1 text-xs text-gray-400 truncate">{r.region}</p>
           )}
-          {r.channels && r.channels.length > 0 && (
+          {r.foods_mentioned && r.foods_mentioned.length > 0 && (
             <div className="flex flex-wrap gap-1 mt-1.5">
+              {r.foods_mentioned.slice(0, 5).map((f, i) => (
+                <span
+                  key={i}
+                  className="px-1.5 py-0.5 bg-orange-50 text-orange-700 rounded text-[10px]"
+                >
+                  {f}
+                </span>
+              ))}
+              {r.foods_mentioned.length > 5 && (
+                <span className="text-[10px] text-gray-400">+{r.foods_mentioned.length - 5}</span>
+              )}
+            </div>
+          )}
+          {r.channels && r.channels.length > 0 && (
+            <div className="flex flex-wrap gap-1 mt-1">
               {r.channels.map((ch) => (
                 <span
                   key={ch}