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>

README.md

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+# IQAI — Multi-Model AI Dashboard
+
+A sleek AI chat dashboard powered by [Replicate](https://replicate.com). Chat with multiple AI models simultaneously, tag them with @mentions, and augment responses with live web search.
+
+## Features
+
+- **Multi-model chat** — Select multiple models and query them in parallel
+- **@mention routing** — Type `@claude`, `@grok`, `@gemini` to direct messages to specific models
+- **Web search** — Inject DuckDuckGo search results as context before querying models
+- **Model manager** — Add, edit, or remove Replicate models from the UI
+- **System instructions** — Per-model system prompts per conversation
+- **Account info** — View your Replicate account details in the sidebar
+- **Conversation history** — Persisted locally across sessions
+
+## Quick Start (Docker)
+
+```bash
+cp .env.example .env
+# Edit .env and set your REPLICATE_API_TOKEN
+
+docker compose up --build
+# Open http://localhost
+```
+
+## Development
+
+```bash
+# Backend
+cd backend && npm install && node server.js
+
+# Frontend (in another terminal)
+cd frontend && npm install && npm run dev
+```
+
+## Adding Models
+
+Click **Manage Models** in the sidebar. Paste any Replicate model API URL to auto-fill the fields:
+
+```
+https://api.replicate.com/v1/models/owner/model-name/predictions
+```
+
+## Default Models
+
+| Model | Tag | Type |
+|-------|-----|------|
+| Claude Opus 4.6 | @claude | Text |
+| Grok 4 | @grok | Text |
+| Gemini 3.1 Pro | @gemini | Text |
+| DeepSeek R1 | @deepseek | Text |
+
+## Architecture
+
+```
+iqai/
+├── backend/          Express API server (port 3001)
+│   ├── routes/       chat, models, account, search
+│   └── data/         models.json (persisted config)
+├── frontend/         React + Vite + Tailwind
+│   └── src/
+│       ├── components/
+│       ├── store/    Zustand state management
+│       └── utils/    API client
+├── docker-compose.yml
+├── Dockerfile.backend
+├── Dockerfile.frontend
+└── nginx.conf
+```