feat(phase1): wire email notifications, shared email crate, AppState for services
- Create crates/email shared Mailer with 18+ templates (auth, approvals, jobs, leads, tracecoins)
- users/mail.rs now re-exports from shared crate (lettre dep removed)
- Wire password changed/reset emails in users auth handlers
- Wire profile approval/rejection emails in users approvals handlers (company, customer, all 9 professional types)
- Wire job approved/rejected emails in users approvals handlers
- Wire requirement approved email in users approvals handlers
- Add AppState (pool + mail) to companies service; wire submit_job and update_application_status emails
- Add AppState (pool + mail) to customers service; wire submit_requirement, approve_request, reject_request emails (incl. contact-exchange on lead acceptance)
- Add AppState (pool + storage) to job_seekers service with resume upload multipart handler
- Wire lead cancellation and accepted-leads handlers in contracts/profession_shared.rs
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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