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>

frontend/tailwind.config.js

@@ -0,0 +1,55 @@
+/** @type {import('tailwindcss').Config} */
+export default {
+  content: ['./index.html', './src/**/*.{js,jsx}'],
+  theme: {
+    extend: {
+      fontFamily: {
+        sans: ['Poppins', 'Inter', 'system-ui', 'sans-serif'],
+        display: ['Montserrat', 'Poppins', 'sans-serif'],
+        mono: ['JetBrains Mono', 'Fira Code', 'monospace']
+      },
+      colors: {
+        // Brand palette
+        apricot: '#f9dbbd',
+        tangerine: '#fca17d',
+        blush: '#da627d',
+        grape: '#9a348e',
+        midnight: '#0d0628',
+        // Surface shades (midnight-violet based)
+        surface: {
+          0: '#0d0628',
+          1: '#110830',
+          2: '#180d40',
+          3: '#1e1150',
+          4: '#261560'
+        }
+      },
+      backgroundImage: {
+        'brand-gradient': 'linear-gradient(135deg, #f9dbbd, #fca17d, #da627d, #9a348e, #0d0628)',
+        'brand-gradient-r': 'linear-gradient(90deg, #9a348e, #da627d, #fca17d)',
+        'brand-gradient-v': 'linear-gradient(180deg, #9a348e 0%, #0d0628 100%)',
+        'glow-grape': 'radial-gradient(circle at center, #9a348e40, transparent 70%)',
+        'glow-blush': 'radial-gradient(circle at center, #da627d30, transparent 70%)'
+      },
+      boxShadow: {
+        'grape': '0 0 20px #9a348e40',
+        'blush': '0 0 20px #da627d30',
+        'tangerine': '0 0 20px #fca17d30'
+      },
+      animation: {
+        'fade-in': 'fadeIn 0.2s ease-out',
+        'slide-up': 'slideUp 0.25s ease-out',
+        'glow-pulse': 'glowPulse 3s ease-in-out infinite'
+      },
+      keyframes: {
+        fadeIn: { from: { opacity: 0 }, to: { opacity: 1 } },
+        slideUp: { from: { opacity: 0, transform: 'translateY(10px)' }, to: { opacity: 1, transform: 'translateY(0)' } },
+        glowPulse: {
+          '0%, 100%': { boxShadow: '0 0 15px #9a348e30' },
+          '50%': { boxShadow: '0 0 30px #9a348e60' }
+        }
+      }
+    }
+  },
+  plugins: []
+};