feat: initial IQAI multi-model AI dashboard

- Express backend with Replicate API proxy (chat, models, account, search)
- React + Vite + Tailwind frontend with custom Midnight Violet color scheme
- @mention autocomplete to route messages to specific models
- Parallel multi-model queries with model selection in sidebar
- DuckDuckGo web search context injection
- Model manager UI (add/edit/remove Replicate models)
- Per-model system instructions per conversation
- Replicate account info display in sidebar
- Conversation history with local persistence (Zustand)
- Full Docker deployment (backend + nginx-served frontend)
- Montserrat + Poppins fonts

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

docker-compose.yml

@@ -0,0 +1,46 @@
+version: '3.9'
+
+services:
+  backend:
+    build:
+      context: .
+      dockerfile: Dockerfile.backend
+    container_name: iqai-backend
+    restart: unless-stopped
+    environment:
+      - REPLICATE_API_TOKEN=${REPLICATE_API_TOKEN}
+      - FRONTEND_URL=${FRONTEND_URL:-http://localhost}
+      - PORT=3001
+    volumes:
+      # Persist model config across container restarts
+      - iqai-models:/app/data
+    healthcheck:
+      test: ["CMD", "wget", "-qO-", "http://localhost:3001/api/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 10s
+    networks:
+      - iqai-net
+
+  frontend:
+    build:
+      context: .
+      dockerfile: Dockerfile.frontend
+    container_name: iqai-frontend
+    restart: unless-stopped
+    ports:
+      - "${FRONTEND_PORT:-80}:80"
+    depends_on:
+      backend:
+        condition: service_healthy
+    networks:
+      - iqai-net
+
+volumes:
+  iqai-models:
+    driver: local
+
+networks:
+  iqai-net:
+    driver: bridge