feat: SWG 가스켓 전체 구성 정보 표시 개선

- H/F/I/O SS304/GRAPHITE/CS/CS 패턴에서 4개 구성요소 모두 표시
- 기존 SS304 + GRAPHITE → SS304/GRAPHITE/CS/CS로 완전한 구성 표시
- 외부링/필러/내부링/추가구성 모든 정보 포함
- 구매수량 계산 모달에서 정확한 재질 정보 확인 가능

backend/app/routers/files.py

@@ -12,7 +12,11 @@ from pathlib import Path
 import json
 
 from ..database import get_db
+from ..utils.logger import get_logger
 from app.services.material_classifier import classify_material
+
+# 로거 설정
+logger = get_logger(__name__)
 from app.services.integrated_classifier import classify_material_integrated, should_exclude_material
 from app.services.bolt_classifier import classify_bolt
 from app.services.flange_classifier import classify_flange
@@ -664,10 +668,15 @@ async def upload_file(
                 else:
                     gasket_type = str(gasket_type_info) if gasket_type_info else "UNKNOWN"
                 
-                # 가스켓 소재 (GRAPHITE, PTFE 등)
+                # 가스켓 소재 - SWG의 경우 메탈 부분을 우선으로
                 material_type = ""
                 if isinstance(gasket_material_info, dict):
-                    material_type = gasket_material_info.get("material", "UNKNOWN")
+                    # SWG 상세 정보가 있으면 메탈 부분을 material_type으로 사용
+                    swg_details = gasket_material_info.get("swg_details", {})
+                    if swg_details and swg_details.get("outer_ring"):
+                        material_type = swg_details.get("outer_ring", "UNKNOWN")  # SS304
+                    else:
+                        material_type = gasket_material_info.get("material", "UNKNOWN")
                 else:
                     material_type = str(gasket_material_info) if gasket_material_info else "UNKNOWN"
                 
@@ -978,7 +987,7 @@ async def get_files(
     try:
         query = """
             SELECT id, filename, original_filename, job_no, revision, 
-                   description, file_size, parsed_count, created_at, is_active
+                   description, file_size, parsed_count, upload_date, is_active
             FROM files
             WHERE is_active = TRUE
         """
@@ -988,7 +997,7 @@ async def get_files(
             query += " AND job_no = :job_no"
             params["job_no"] = job_no
         
-        query += " ORDER BY created_at DESC"
+        query += " ORDER BY upload_date DESC"
         
         result = db.execute(text(query), params)
         files = result.fetchall()
@@ -1003,7 +1012,7 @@ async def get_files(
                 "description": file.description,
                 "file_size": file.file_size,
                 "parsed_count": file.parsed_count,
-                "created_at": file.created_at,
+                "created_at": file.upload_date,
                 "is_active": file.is_active
             }
             for file in files
@@ -1012,6 +1021,47 @@ async def get_files(
     except Exception as e:
         raise HTTPException(status_code=500, detail=f"파일 목록 조회 실패: {str(e)}")
 
+@router.get("/stats")
+async def get_files_stats(db: Session = Depends(get_db)):
+    """파일 및 자재 통계 조회"""
+    try:
+        # 총 파일 수
+        files_query = text("SELECT COUNT(*) FROM files WHERE is_active = true")
+        total_files = db.execute(files_query).fetchone()[0]
+        
+        # 총 자재 수
+        materials_query = text("SELECT COUNT(*) FROM materials")
+        total_materials = db.execute(materials_query).fetchone()[0]
+        
+        # 최근 업로드 (최근 5개)
+        recent_query = text("""
+            SELECT f.original_filename, f.upload_date, f.parsed_count, j.job_name
+            FROM files f
+            LEFT JOIN jobs j ON f.job_no = j.job_no
+            WHERE f.is_active = true
+            ORDER BY f.upload_date DESC
+            LIMIT 5
+        """)
+        recent_uploads = db.execute(recent_query).fetchall()
+        
+        return {
+            "success": True,
+            "totalFiles": total_files,
+            "totalMaterials": total_materials,
+            "recentUploads": [
+                {
+                    "filename": upload.original_filename,
+                    "created_at": upload.upload_date,
+                    "parsed_count": upload.parsed_count or 0,
+                    "project_name": upload.job_name or "Unknown"
+                }
+                for upload in recent_uploads
+            ]
+        }
+        
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f"통계 조회 실패: {str(e)}")
+
 @router.delete("/files/{file_id}")
 async def delete_file(file_id: int, db: Session = Depends(get_db)):
     """파일 삭제"""