Stage C of staged Phase 10 redo. Restores dangling phase10-wip work:
- schema.ts: leads expansion + activities/reminders tables + relations
- lead-service.ts / lead-validators.ts service layer
- /admin/leads list + detail + actions, LeadTable/LeadDetail/LeadForm
- LogActivityModal, SendQuoteModal, FollowUpWidget on dashboard
- migration 0005 (applied to prod DB in Stage B, along with
previously-missing 0001/0003/0004 — root cause of all post-deploy
500s: prod DB had no migrations applied since 0000)
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
