feat(restaurant): #332 PUT body 화이트리스트 명시화

ALLOWED_UPDATE_FIELDS set으로 PUT /api/restaurants/{id} body를 SQL updateFields
컬럼 가드와 1:1로 매핑. 허용 외 키는 silent drop + DEBUG 로그.

기존 SQL <if containsKey>로 이미 임의 컬럼 갱신이 차단되어 있으나, Controller에
명시 화이트리스트가 없어 의도 모호. 본 변경으로 두 레이어 모두 화이트리스트 확보.

sanitized가 비면 200 no-op로 응답 (사용자 경험 우선).

DDG/isNameSimilar/DTO는 별도 후속 (예: #346) 분리.

설계서: docs/design/332-restaurant-update-whitelist/README.md

Refs: #332

backend-java/src/main/java/com/tasteby/controller/RestaurantController.java

@@ -90,15 +90,34 @@ public class RestaurantController {
         return r;
     }
 
+    // #332 — Restaurant 업데이트 화이트리스트 (SQL updateFields의 컬럼 가드와 1:1).
+    // 허용되지 않은 키는 무시(silent drop). DTO 도입은 후속 작업.
+    private static final java.util.Set<String> ALLOWED_UPDATE_FIELDS = java.util.Set.of(
+            "name", "address", "region", "cuisine_type", "price_range",
+            "phone", "website", "tabling_url", "catchtable_url",
+            "latitude", "longitude", "google_place_id",
+            "business_status", "rating", "rating_count"
+    );
+
     @PutMapping("/{id}")
     public Map<String, Object> update(@PathVariable String id, @RequestBody Map<String, Object> body) {
         AuthUtil.requireAdmin();
         var r = restaurantService.findById(id);
         if (r == null) throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Restaurant not found");
 
+        // #332 — 입력 body를 허용 키만 통과시킨 가변 Map으로 정규화
+        Map<String, Object> sanitized = new java.util.LinkedHashMap<>();
+        for (var e : body.entrySet()) {
+            if (ALLOWED_UPDATE_FIELDS.contains(e.getKey())) {
+                sanitized.put(e.getKey(), e.getValue());
+            } else {
+                log.debug("Ignoring non-whitelisted update field: {}", e.getKey());
+            }
+        }
+
         // Re-geocode if name or address changed
-        String newName = (String) body.get("name");
-        String newAddress = (String) body.get("address");
+        String newName = (String) sanitized.get("name");
+        String newAddress = (String) sanitized.get("address");
         boolean nameChanged = newName != null && !newName.equals(r.getName());
         boolean addressChanged = newAddress != null && !newAddress.equals(r.getAddress());
         if (nameChanged || addressChanged) {
@@ -106,26 +125,30 @@ public class RestaurantController {
             String geoAddr = newAddress != null ? newAddress : r.getAddress();
             var geo = geocodingService.geocodeRestaurant(geoName, geoAddr);
             if (geo != null) {
-                body.put("latitude", geo.get("latitude"));
-                body.put("longitude", geo.get("longitude"));
-                body.put("google_place_id", geo.get("google_place_id"));
+                sanitized.put("latitude", geo.get("latitude"));
+                sanitized.put("longitude", geo.get("longitude"));
+                sanitized.put("google_place_id", geo.get("google_place_id"));
                 if (geo.containsKey("formatted_address")) {
-                    body.put("address", geo.get("formatted_address"));
+                    sanitized.put("address", geo.get("formatted_address"));
                 }
-                if (geo.containsKey("rating")) body.put("rating", geo.get("rating"));
-                if (geo.containsKey("rating_count")) body.put("rating_count", geo.get("rating_count"));
-                if (geo.containsKey("phone")) body.put("phone", geo.get("phone"));
-                if (geo.containsKey("business_status")) body.put("business_status", geo.get("business_status"));
+                if (geo.containsKey("rating")) sanitized.put("rating", geo.get("rating"));
+                if (geo.containsKey("rating_count")) sanitized.put("rating_count", geo.get("rating_count"));
+                if (geo.containsKey("phone")) sanitized.put("phone", geo.get("phone"));
+                if (geo.containsKey("business_status")) sanitized.put("business_status", geo.get("business_status"));
 
-                // formatted_address에서 region 파싱 (예: "대한민국 서울특별시 강남구 ..." → "한국|서울|강남구")
                 String addr = (String) geo.get("formatted_address");
                 if (addr != null) {
-                    body.put("region", GeocodingService.parseRegionFromAddress(addr));
+                    sanitized.put("region", GeocodingService.parseRegionFromAddress(addr));
                 }
             }
         }
 
-        restaurantService.update(id, body);
+        if (sanitized.isEmpty()) {
+            // 허용 키가 하나도 없으면 no-op
+            return Map.of("ok", true, "restaurant", r);
+        }
+
+        restaurantService.update(id, sanitized);
         cache.flush();
         var updated = restaurantService.findById(id);
         return Map.of("ok", true, "restaurant", updated);