docs: document base field default values

[zgz2048]

Summary

• Document defaultValue examples in the Base field JSON reference for supported field types.
• Clarify text style CellValue rules for url, phone, and email.
• Add default value support and clearing notes to the existing field JSON guidance.

Validation

• Parsed JSON examples in lark-base-field-json.md and lark-base-cell-value.md.
• git diff --check -- skills/lark-base/references/lark-base-field-json.md skills/lark-base/references/lark-base-cell-value.md
• node scripts/skill-format-check/index.js

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