feat(sheets): add --type bitable to +sheet-create

[zhengzhijiej-tech]

Problem

+sheet-create could only create plain spreadsheet sub-sheets — there was no way to create a bitable (multi-dimensional table) sub-sheet from the CLI.

Change

• Add a --type flag to +sheet-create (enum sheet | bitable, default sheet).
• --type bitable creates an empty bitable sub-sheet (default table + grid view + default fields). Its content is edited via lark-cli base commands — sheets-side grid tools are rejected on bitable sub-sheets; use +workbook-info to get the sub-sheet's bitable_app_token / bitable_table_id, then lark base +record-*.
• flag-defs.json / flag_defs_gen.go / skill reference are mirror-synced from the spec source: the new --type plus a small max-chars doc alignment the CLI mirror was lagging on.

Mechanism

CLI --type bitable → sheetCreateInput emits operation=create_bitable → invoke_write modify_workbook_structure → backend materializes the bitable sub-sheet. Requires the corresponding backend support (create_bitable operation) to be deployed.

Verification

PPE end-to-end: +sheet-create --type bitable returns ok + sheet_id; +workbook-info confirms the new sub-sheet reports resource_type=bitable with its bitable app_token / table_id; reading it back via lark base +field-list returns the 4 default fields. Invalid / duplicate sheet names are rejected with a validation error. Default --type sheet path is unchanged.

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