infra(04-00): route /c/ → /client/, Dockerfile, Gitea deploy

- Rename src/app/c/[token] → src/app/client/[token]
- Update proxy.ts, ClientRow, admin client detail with /client/ path
- Add output: "standalone" to next.config.ts for Docker build
- Add Dockerfile (multi-stage, node:20-alpine) and .dockerignore
- Push schema to Coolify Postgres via SSH tunnel (drizzle-kit push ✓)
- Update CLAUDE.md constraint 4 to reflect /client/ route
- Add Phase 4 planning artifacts (04-00, 04-RESEARCH, 04-PATTERNS)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.planning/ROADMAP.md

@@ -89,8 +89,9 @@ Decimal phases appear between their surrounding integers in numeric order.
   3. La pagina /admin/projects elenca tutti i progetti con €/h calcolato e bottone timer play/stop
   4. Il link cliente supporta slug personalizzato (/c/mario-rossi) con fallback al token; slug impostabile da /admin/clients/[id]/edit
   5. Il tab Timer di ogni progetto mostra analytics profittabilità: ore lavorate, accepted_total, €/h reale vs target_hourly_rate globale
-**Plans**: 4 plans
+**Plans**: 5 plans
 **Plan list**:
+  - [ ] 04-00-PLAN.md — Infra: Postgres su Coolify + /c/ → /client/ rename + Dockerfile + hub.iamcavalli.net [RUN FIRST]
   - [ ] 04-01-PLAN.md — Schema migration (projects, slug, settings, FK migration) + drizzle-kit push + query layer
   - [ ] 04-02-PLAN.md — Admin projects list (/admin/projects) + ProjectRow + client detail project cards
   - [ ] 04-03-PLAN.md — Admin project workspace (/admin/projects/[id]) + TimerTab + ProfitabilityCard + /admin/impostazioni