feat: add sandboxBaseUrl config to resolve relative URLs in sandbox mode#7203

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jmandel-bot:claude/add-sandbox-base-url-01HHj4vFA3GQcUgPCsJdQe9Tjmandel-bot/mermaid:claude/add-sandbox-base-url-01HHj4vFA3GQcUgPCsJdQe9TCopy head branch name to clipboard