feat: add versioned app chat API and fix release isolation bug

api/app/repositories/app_repository.py

@@ -63,13 +63,13 @@ def get_apps_by_id(db: Session, app_id: uuid.UUID) -> App:
     return repo.get_apps_by_id(app_id)
 
 
-def get_release_by_version(db: Session, app_id: uuid.UUID, version: int):
-    """根据版本号查询发布快照（仅返回激活状态）"""
+def get_release_by_version(db: Session, app_id: uuid.UUID, release_id: uuid.UUID):
+    """根据发布版本ID查询发布快照（仅返回激活状态）"""
     from app.models.app_release_model import AppRelease
     return db.scalars(
         select(AppRelease).where(
             AppRelease.app_id == app_id,
-            AppRelease.version == version,
+            AppRelease.id == release_id,
             AppRelease.is_active.is_(True),
         )
     ).first()