fix(outreach): enforce company dnc and domain suppression cascade (#38)

[kjxcodez]

Summary

Closes #38.

Enforces server-authoritative company-level Do Not Contact (DNC) and domain suppression cascade across audience enrollment, active sequence execution queues, and final send authorization.

Key Changes

• Schema: Added \SuppressionTargetType\ (recipient, company, domain), \COMPANY_DNC\ and \DOMAIN_SUPPRESSION\ suppression reasons, and updated outreach eligibility checks.
• Data Models & Repositories: Extended Suppression model with multi-target support and sparse/unique indexes. Implemented company & domain suppression methods with active sequence execution cancellation cascades.
• Send Gate: Enforced server-authoritative company DNC and domain suppression pre-flight checks in \EmailService.send()\ prior to domain pacing, slot reservation, ledger entry, or provider dispatch.
• Desktop Worker: Gracefully skips contacts blocked by company DNC or domain suppression without tripping circuit breakers or false-positive bounce auto-suppression.
• SDK: Extended \SuppressionsModule\ to support company & domain suppression management.

Verification

• 19 new targeted unit tests covering criteria A-Y including stale-worker cache invalidation at authoritative send gate.
• 151/151 schema tests passing.
• 93/93 email service tests passing.
• 21/21 domain pacing tests passing.
• 17/17 campaign tests passing.
• 130/130 desktop tests passing.

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