Refactor database schema: Remove access list and related entities, add editing session and edit operation entities

- Deleted `access_list_entry`, `location`, `proxy_host`, `proxy_host_access_list`, `session`, `stream_service`, `stream_service_access_list` entities and their corresponding migration files.
- Introduced `editing_session` and `edit_operation` entities with appropriate fields and relationships.
- Updated `mod.rs` and `prelude.rs` to reflect the changes in the entity structure.
- Adjusted migration files to remove obsolete migrations and include new migrations for the editing session and edit operation tables.

public/database/src/generated/entities/upstream.rs

@@ -17,12 +17,6 @@ pub struct Model {
     pub created_at: DateTimeUtc,
     pub updated_at: DateTimeUtc,
     #[sea_orm(has_many)]
-    pub locations: HasMany<super::location::Entity>,
-    #[sea_orm(has_many)]
-    pub proxy_hosts: HasMany<super::proxy_host::Entity>,
-    #[sea_orm(has_many)]
-    pub stream_services: HasMany<super::stream_service::Entity>,
-    #[sea_orm(has_many)]
     pub upstream_targets: HasMany<super::upstream_target::Entity>,
 }