feat: 사이트 검사 동시 검사 수 설정 추가

- 기본값 2→4로 변경, 사용자가 [1, 2, 4, 8] 중 선택 가능
- 백엔드: concurrency 파라미터 추가 (API → 서비스 → Semaphore)
- 프론트: 드롭다운에 "동시 검사 수" 옵션 UI 추가

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

backend/app/core/config.py

@@ -24,7 +24,7 @@ class Settings(BaseSettings):
     # Site inspection
     SITE_MAX_PAGES: int = 500
     SITE_MAX_DEPTH: int = 2
-    SITE_CONCURRENCY: int = 2
+    SITE_CONCURRENCY: int = 4
 
     # Application
     PROJECT_NAME: str = "Web Inspector API"

backend/app/models/site_schemas.py

@@ -30,6 +30,7 @@ class StartSiteInspectionRequest(BaseModel):
     url: HttpUrl
     max_pages: int = Field(default=20, ge=0, le=500, description="최대 크롤링 페이지 수 (0=무제한)")
     max_depth: int = Field(default=2, ge=1, le=3, description="최대 크롤링 깊이")
+    concurrency: int = Field(default=4, ge=1, le=8, description="동시 검사 수")
 
 
 class InspectPageRequest(BaseModel):
@@ -67,6 +68,7 @@ class SiteInspectionConfig(BaseModel):
     """사이트 검사 설정."""
     max_pages: int = 20
     max_depth: int = 2
+    concurrency: int = 4
 
 
 # --- Response Models ---

backend/app/routers/site_inspections.py

@@ -66,6 +66,7 @@ async def start_site_inspection(request: StartSiteInspectionRequest):
             url=url,
             max_pages=request.max_pages,
             max_depth=request.max_depth,
+            concurrency=request.concurrency,
         )
     except httpx.HTTPStatusError as e:
         raise HTTPException(

backend/app/services/site_inspection_service.py

@@ -49,6 +49,7 @@ class SiteInspectionService:
         url: str,
         max_pages: int = 20,
         max_depth: int = 2,
+        concurrency: int = 4,
     ) -> str:
         """
         Start a site-wide inspection.
@@ -65,6 +66,7 @@ class SiteInspectionService:
         if max_pages > 0:
             max_pages = min(max_pages, settings.SITE_MAX_PAGES)
         max_depth = min(max_depth, settings.SITE_MAX_DEPTH)
+        concurrency = min(concurrency, settings.SITE_CONCURRENCY)
 
         site_inspection_id = str(uuid.uuid4())
         parsed = urlparse(url)
@@ -81,6 +83,7 @@ class SiteInspectionService:
             "config": {
                 "max_pages": max_pages,
                 "max_depth": max_depth,
+                "concurrency": concurrency,
             },
             "discovered_pages": [],
             "aggregate_scores": None,
@@ -88,13 +91,13 @@ class SiteInspectionService:
         await self.db.site_inspections.insert_one(doc)
 
         logger.info(
-            "Site inspection started: id=%s, url=%s, max_pages=%d, max_depth=%d",
-            site_inspection_id, url, max_pages, max_depth,
+            "Site inspection started: id=%s, url=%s, max_pages=%d, max_depth=%d, concurrency=%d",
+            site_inspection_id, url, max_pages, max_depth, concurrency,
         )
 
         # Launch background task
         asyncio.create_task(
-            self._crawl_and_inspect(site_inspection_id, url, max_pages, max_depth)
+            self._crawl_and_inspect(site_inspection_id, url, max_pages, max_depth, concurrency)
         )
 
         return site_inspection_id
@@ -268,6 +271,7 @@ class SiteInspectionService:
         url: str,
         max_pages: int,
         max_depth: int,
+        concurrency: int = 4,
     ) -> None:
         """
         Background task that runs in two phases:
@@ -349,8 +353,7 @@ class SiteInspectionService:
             # ==============================
             logger.info("Phase 2 (inspection) started: %s", site_inspection_id)
 
-            settings = get_settings()
-            semaphore = asyncio.Semaphore(settings.SITE_CONCURRENCY)
+            semaphore = asyncio.Semaphore(concurrency)
 
             tasks = [
                 self._inspect_page_with_semaphore(