CLI: file format examples in lists import --help

Features

• CLI: file format examples in lists import --help
• Docs: safety settings page with full schema reference
• Docs: CLI examples and explicit tone values for humanizer page
• Docs: CLI examples for domain rate-limits and warmup subcommands
• Docs: login links section in authentication page
• Docs: expanded dns-check section with response examples and next steps
• Docs: expanded lists import --file format documentation
• Docs: config schema, CLI examples, and required flag annotations

Fixes

• Humanizer: list valid tone values in help text
• Docs build: pre-generate fumadocs .source to prevent turbo race condition
• Docs: destructive-action warning on domains remove
• Docs: document safety update --settings schema