fix: 쿼리 파라미터 다르면 유니크 URL로 판단 — 트래킹 파라미터 제거 로직 삭제

모든 쿼리 파라미터를 보존하여 파라미터가 다른 URL은 별도 페이지로 취급.

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

backend/app/services/link_crawler.py

@@ -40,7 +40,7 @@ def normalize_url(url: str) -> str:
     - Remove trailing slash (except for root path)
     - Lowercase scheme and netloc
     - Strip www. prefix for consistent deduplication
-    - Remove common tracking query parameters
+    - Query parameters are preserved as-is (different params = different page)
     """
     parsed = urlparse(url)
 
@@ -62,17 +62,6 @@ def normalize_url(url: str) -> str:
         path = path.rstrip("/")
     normalized = normalized._replace(path=path)
 
-    # Remove common tracking query parameters
-    if normalized.query:
-        from urllib.parse import parse_qs, urlencode
-        _TRACKING_PARAMS = {
-            "utm_source", "utm_medium", "utm_campaign", "utm_term",
-            "utm_content", "ref", "fbclid", "gclid", "mc_cid", "mc_eid",
-        }
-        params = parse_qs(normalized.query, keep_blank_values=True)
-        filtered = {k: v for k, v in params.items() if k.lower() not in _TRACKING_PARAMS}
-        normalized = normalized._replace(query=urlencode(filtered, doseq=True))
-
     return urlunparse(normalized)