feat: Add Resend SMTP integration, free lead discovery & email resolution, and local dashboard

[juliolimacostavalladares]

Summary of Changes

1. Resend Outbound Email Integration (Full SMTP Spec)

• Host & Credentials: Configures smtp.resend.com automatically when an API key starting with re_ is provided. Uses literal username "resend".
• Port & Transport Flexibility:
  • SMTPS (Implicit SSL/TLS) on ports 465 and 2465 using smtplib.SMTP_SSL.
  • STARTTLS (Explicit SSL/TLS) on ports 25, 587 (default), and 2587 using smtplib.SMTP upgraded with starttls().
• Idempotency Key Support: Automatically attaches the Resend-Idempotency-Key header (e.g. openoutreach-<id>-<msgid>) to prevent duplicate email transmissions on retries.
• Gmail Threading Protection: Automatically injects X-Entity-Ref-ID for initial cold outreach to prevent Gmail from grouping unrelated outreach emails.
• IMAP Graceful Bypass: Bypasses IMAP warmth measurement and folder sync since Resend provides an outbound-only SMTP interface.

2. Free Lead Discovery & Email Resolution (Zero-Cost Alternative)

• Replaces the hard requirement for a paid BetterContact API key with a built-in free discovery engine and free email resolver:
  • Free Discovery: Uses the configured LLM (e.g. 9router with cbai/minimax-m3) based on product_docs and campaign_target to generate high-fit B2B prospects in Brazil with realistic roles, companies, and LinkedIn profiles.
  • Free Email Resolver: Resolves corporate email patterns (first.last@domain, first@domain) with MX verification and unlimited credit balance.
  • Automatically promotes qualified leads for email lookup at zero financial cost.

3. Gateway & Model Prefix Normalization

• Supports local gateways like 9router (http://localhost:20128/v1) by auto-prefixing openai_compatible: when no provider prefix is supplied.
• Added pydantic-ai 2.x compatibility shim aliasing OpenAIModel to OpenAIChatModel.

4. Local Web Dashboard & Job Diagnostics

• Adds a local web interface (openoutreach-web) at http://127.0.0.1:8000 with a Portuguese UI for reviewing leads, viewing match rationale, managing campaign parameters, and triggering bounded searches.
• Captures child process stderr in jobs.py so exact error diagnostics are displayed in the dashboard banner if an issue arises.
• Updates dashboard cards to display Free Provider and Resend status.

5. Automated Tests

• Full test suite passing (44 tests in pytest), covering adapters, web views, forms normalization, export, wizard workflows, and Resend port/idempotency tests.

[eracle]

Sorry but this part was moved to openOutSend, check it out