fix(tasks): isolate worker execution scopes

Persist a required Server-owned execution scope and enforce it for listing, claiming, lease recovery and SCADA verification. Backfill existing tasks explicitly through migration 034 so local development workers no longer claim production tasks from the shared database.

app/core/config.py

@@ -8,6 +8,12 @@ from pydantic_settings import BaseSettings, SettingsConfigDict
 class Settings(BaseSettings):
     PROJECT_NAME: str = "TJWater Server"
     ENVIRONMENT: str = "production"
+    OPERATIONAL_TASK_EXECUTION_SCOPE: str = ""
+
+    @property
+    def operational_task_execution_scope(self) -> str:
+        return self.OPERATIONAL_TASK_EXECUTION_SCOPE.strip() or self.ENVIRONMENT
+
     API_V1_STR: str = "/api/v1"
     NETWORK_NAME: str = "default_network"
     # 敏感配置加密密钥 (Fernet)