Update specs to match implementation
Addresses spec drift items #3, 5, 6, 7, 8, 9, 10, 11, 12 from #147:
- transactional-emails: Resend → Nodemailer + SMTP
- infrastructure: CX21 → cx23
- secret-management: single secrets.env → split app/infra files
- brouter-integration: 5s failover delay → instant via clientID election
- brouter-integration: 2 profiles → 5 (trekking, fastbike, safety, shortest, car)
- observability: add version field to health response
- observability: add brouter_request_duration_seconds metric
- planner-session: remove 30-day max ceiling (not enforced)
- shared-packages: clarify map package scope vs planner-specific features
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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