* refactor(base): enforce field-map record upsert input
1. Reject top-level fields wrappers in base +record-upsert input and keep request bodies as field maps.
2. Replace record-upsert tests with Map<FieldNameOrID, CellValue> input and assert the outgoing body has no fields wrapper.
3. Consolidate Base record value documentation around lark-base-cell-value and update record command references.
* refactor(base): use common record JSON parsing for upsert
1. Remove the dedicated record-upsert parser and restore the shared record JSON object validation path.
2. Keep record-upsert dry-run and execution as raw JSON object passthrough.
3. Drop the test assertion that rejected a top-level fields key for record-upsert.
* docs(base): refine record cell value guidance
1. Align record CellValue examples with live behavior for date, URL, user, link, select, numeric styles, and readonly fields.
2. Remove misleading user_id_type and execution identity prompts from record-writing guidance.
3. Keep record JSON file input guidance generic and avoid documenting environment-specific stdin or path limits.
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