refactor: align backend with company-site-member schema and system-level RBAC groups

app/repositories/sites_repo.py

@@ -0,0 +1,40 @@
+from sqlalchemy import func, or_, select
+from sqlalchemy.orm import Session
+
+from app.models.site import Site
+
+
+class SitesRepository:
+    def __init__(self, db: Session) -> None:
+        self.db = db
+
+    def get_by_key(self, site_key: str) -> Site | None:
+        stmt = select(Site).where(Site.site_key == site_key)
+        return self.db.scalar(stmt)
+
+    def list(
+        self,
+        keyword: str | None = None,
+        company_id: str | None = None,
+        limit: int = 100,
+        offset: int = 0,
+    ) -> tuple[list[Site], int]:
+        stmt = select(Site)
+        count_stmt = select(func.count()).select_from(Site)
+        if keyword:
+            pattern = f"%{keyword}%"
+            cond = or_(Site.site_key.ilike(pattern), Site.name.ilike(pattern))
+            stmt = stmt.where(cond)
+            count_stmt = count_stmt.where(cond)
+        if company_id:
+            stmt = stmt.where(Site.company_id == company_id)
+            count_stmt = count_stmt.where(Site.company_id == company_id)
+        stmt = stmt.order_by(Site.created_at.desc()).limit(limit).offset(offset)
+        return list(self.db.scalars(stmt).all()), int(self.db.scalar(count_stmt) or 0)
+
+    def create(self, site_key: str, company_id: str, name: str, status: str = "active") -> Site:
+        item = Site(site_key=site_key, company_id=company_id, name=name, status=status)
+        self.db.add(item)
+        self.db.commit()
+        self.db.refresh(item)
+        return item