feat: add contract renewal automation and upsell recommendation engin…

[Chuks-coderr]

…e (#560 #561)

Issue 560 - Contract renewal automation:

• Add renewal types (RenewalMilestone, RenewalStatus, ApprovalWorkflow, etc.)
• Add RenewalService with quote generation, negotiation workspace, approval chain, e-signature integration, win/loss tracking, auto vs opt-in renewal, and mid-negotiation freeze support
• Add RenewalMilestoneChecker cron for 90/60/30-day milestone alerts
• Add RenewalWorkspaceScreen with full negotiation UI

Issue 561 - Upsell recommendation engine:

• Add upsell types (RecommendationTrigger, ConversionFunnel, etc.)
• Add RecommendationService with collaborative filtering, A/B test assignment, merchant trigger config, and conversion funnel tracking
• Add UpsellWidget and RecommendationCard embeddable components
• Handle edge cases: max-tier subscriber, control A/B variant

Misc:

• Register RenewalWorkspace screen in navigation
• Update .gitignore to exclude test snapshots and stray working files

Pull Request Checklist

Quality Gates (All must pass before merge)

• Lint: Code passes ESLint and Prettier checks
• Type Check: TypeScript compilation succeeds
• Tests: All tests pass
• Build: Project builds successfully
• Rust Format: Smart contract formatting is correct
• Rust Clippy: Smart contract linting passes
• Rust Tests: All smart contract tests pass
• Rust Build: Smart contracts compile successfully

Additional Requirements

• New code has appropriate TypeScript types
• No hardcoded secrets or credentials
• New features have corresponding tests
• Documentation updated if needed

Reviewers

• At least 1 approval required for merge
• All CI checks must be green

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This PR will not be mergeable until all quality gates pass.
closes
closes #560
closes #561

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