Phase 2: AI Chat, Calendar, Odoo connector, PWA

- AI Chat endpoint (/api/v1/chat) with Claude API context
- Calendar page with FullCalendar.js (day/week/month)
- Odoo API connector (import/export/webhook)
- PWA manifest + service worker for offline
- SW register component

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/tasks/public/icon-192.png.svg

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+  <rect width="192" height="192" rx="32" fill="#3B82F6"/>
+  <text x="96" y="120" text-anchor="middle" font-size="100" fill="white" font-family="sans-serif">T</text>
+</svg>