Initial commit: AutonetSellCar platform with deployment system

- Frontend: Next.js 14 with TypeScript
- Backend: FastAPI with SQLAlchemy
- Agent: Carmodoo sync agent
- Deployment: Docker Compose based staging/production setup
- Scripts: Automated deployment with rollback support

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/app/api/settings.py

@@ -0,0 +1,72 @@
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy.orm import Session
+
+from ..database import get_db
+from ..models.settings import SystemSettings
+from ..schemas.settings import SystemSettingsUpdate, SystemSettingsResponse
+from .auth import get_current_user
+from ..models import User
+
+router = APIRouter(prefix="/settings", tags=["settings"])
+
+
+def get_admin_user(current_user: User = Depends(get_current_user)) -> User:
+    """관리자 권한 확인 (임시: 모든 로그인 사용자 허용)"""
+    return current_user
+
+
+def get_or_create_settings(db: Session) -> SystemSettings:
+    """시스템 설정 조회 또는 기본값 생성"""
+    settings = db.query(SystemSettings).first()
+    if not settings:
+        settings = SystemSettings(
+            search_page_size=20,
+            korea_margin_percent=5.0,
+            mongolia_margin_percent=5.0,
+            cc_per_usdc=1,  # 1 USD = 1 CC
+            cc_per_view=1,  # 차량 상세 조회 시 1 CC
+            cars_per_cc=3,  # 1 CC = 3 recommended vehicles per request
+            cc_signup_bonus=3,  # 3 CC free on signup
+            cache_ttl_hours=2,
+            container_logistics_usd=3600,
+            shoring_cost_usd=300,
+        )
+        db.add(settings)
+        db.commit()
+        db.refresh(settings)
+    return settings
+
+
+# ==================== Public Endpoints ====================
+
+@router.get("/", response_model=SystemSettingsResponse)
+def get_system_settings(db: Session = Depends(get_db)):
+    """시스템 설정 조회 (Public)"""
+    return get_or_create_settings(db)
+
+
+@router.get("/search-page-size")
+def get_search_page_size(db: Session = Depends(get_db)):
+    """검색 결과 페이지 크기 조회 (Public)"""
+    settings = get_or_create_settings(db)
+    return {"search_page_size": settings.search_page_size}
+
+
+# ==================== Admin Endpoints ====================
+
+@router.put("/", response_model=SystemSettingsResponse)
+def update_system_settings(
+    settings_data: SystemSettingsUpdate,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_admin_user)
+):
+    """시스템 설정 수정 (Admin)"""
+    settings = get_or_create_settings(db)
+
+    update_data = settings_data.model_dump(exclude_unset=True)
+    for field, value in update_data.items():
+        setattr(settings, field, value)
+
+    db.commit()
+    db.refresh(settings)
+    return settings