feat: add send_email MCP tool

[sweetmantech]

• Add RECOUP_FROM_EMAIL constant to lib/const.ts
• Create sendEmailSchema for input validation
• Implement registerSendEmailTool for MCP server
• Add unit tests for the new tool

Migrates sendEmailTool from Recoup-Chat to API MCP server

🤖 Generated with Claude Code

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Project	Deployment	Review	Updated (UTC)
recoup-api	Ready	Preview	Jan 7, 2026 5:11pm

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