[Base] Add +table-batch-create and +table-batch-delete shortcuts

Prerequisites

• I searched existing issues and discussions, this is not already proposed.
• This is a concrete, actionable proposal, not a vague wish.

Problem or motivation

Table management is single-table only (+table-create, +table-delete). When scaffolding a Base with several tables, agents loop over single creates, and cleanup loops over single deletes. The platform exposes batch endpoints for both:

POST /open-apis/bitable/v1/apps/:app_token/tables/batch_create
POST /open-apis/bitable/v1/apps/:app_token/tables/batch_delete

Proposed solution

Two shortcuts:

• +table-batch-create --base-token --json <tables array> (risk: write, scope: base:table:create). Each entry takes name, optional default_view_name, and optional fields in the same shape +field-create accepts. Returns table_ids in input order.
• +table-batch-delete --base-token --table-ids <comma list> (risk: high-risk-write, scope: base:table:delete, max 50 IDs per call per the API limit). Deletion is irreversible, so the high-risk gate with --yes fits the existing taxonomy.

Both directions were verified against a live tenant: create two tables, confirm via +table-list, batch delete them, confirm removal.

Alternatives considered

Looping over the existing single-table commands. It works but multiplies rate-limit exposure (10 writes per second per table), produces no single atomic request to preview with --dry-run, and leaves partial scaffolds when one call in the middle fails.

Start by locating the existing +table-create and +table-delete entry points and the Base table API client, then compare their argument and risk-gate handling with the proposed batch endpoints. Done means both shortcuts accept the specified inputs and limits, preserve create input order, enforce --yes for deletion, and their results can be confirmed through +table-list.