feat: Add Instantly.ai v2 API plugin with 20 actions

Summary

Adds a comprehensive Instantly.ai v2 API integration plugin with 20 actions for email outreach automation.

Actions Added

Lead Operations (7)

• Create Lead - Add a new lead to a campaign
• Get Lead - Retrieve lead details by ID
• List Leads - List leads with pagination
• Update Lead - Modify lead properties
• Delete Lead - Remove a lead
• Update Lead Interest Status - Change lead interest level
• Add Lead to Campaign - Associate lead with campaign

Campaign Operations (7)

• Create Campaign - Create a new email campaign
• Get Campaign - Retrieve campaign details
• List Campaigns - List campaigns with optional status filter
• Update Campaign - Modify campaign settings
• Delete Campaign - Remove a campaign
• Activate Campaign - Start a campaign
• Pause Campaign - Pause a running campaign

Account Operations (4)

• List Accounts - List email sending accounts
• Get Account - Retrieve account details
• Pause Account - Pause an email account
• Resume Account - Resume a paused account

Warmup Operations (2)

• Enable Warmup - Enable email warmup for an account
• Disable Warmup - Disable email warmup

Technical Details

• Uses Instantly v2 API (https://api.instantly.ai/api/v2)
• Bearer token authentication
• All steps follow standardized output format per AGENTS.md:
  • Success: { success: true, data: {...} }
  • Error: { success: false, error: { message: '...' } }
• No SDK dependencies (uses native fetch)
• All 20 actions tested and verified working

Checklist

• Type check passes (pnpm type-check)
• Lint/format passes (pnpm fix)
• Build succeeds (pnpm build)
• All 20 actions manually tested
• Follows existing plugin patterns (Resend, Stripe, etc.)
• No console.log or debug code
• Logo included (/public/instantly-logo.png)

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Pull Request opened by Augment Code with guidance from the PR author