feat(web): add Next.js portfolio with live MT5 dashboard

- Linear design system (dark canvas, lavender accent)
- Live account stats, open positions, pending orders (30s polling)
- Trade history with equity curve chart
- Backtest results table
- Proxy API routes — MT5_BASE_URL server-side only, never exposed to browser
- Deploy on Vercel: set MT5_BASE_URL env var

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

web/tailwind.config.ts

@@ -0,0 +1,69 @@
+import type { Config } from "tailwindcss";
+
+const config: Config = {
+  content: ["./app/**/*.{ts,tsx}", "./components/**/*.{ts,tsx}"],
+  theme: {
+    extend: {
+      colors: {
+        // Linear surface ladder
+        canvas:    "#010102",
+        "s1":      "#0f1011",
+        "s2":      "#141516",
+        "s3":      "#18191a",
+        // Hairlines
+        "hl":      "#23252a",
+        "hl-strong":"#34343a",
+        // Text
+        ink:       "#f7f8f8",
+        "ink-md":  "#d0d6e0",
+        "ink-sub": "#8a8f98",
+        "ink-ter": "#62666d",
+        // Accent (lavender-blue — use sparingly)
+        accent:    "#5e6ad2",
+        "accent-hover": "#828fff",
+        "accent-focus": "#5e69d1",
+        // Inverse (rare)
+        "inv-canvas": "#ffffff",
+        "inv-ink":    "#000000",
+        // Trading semantic
+        bull:  "#27a644",
+        bear:  "#e5484d",
+        "bull-subtle": "rgba(39,166,68,0.12)",
+        "bear-subtle": "rgba(229,72,77,0.12)",
+      },
+      borderRadius: {
+        xs:   "4px",
+        sm:   "6px",
+        md:   "8px",
+        lg:   "12px",
+        xl:   "16px",
+        xxl:  "24px",
+        pill: "9999px",
+      },
+      fontFamily: {
+        sans: ["Inter", "-apple-system", "system-ui", "Segoe UI", "sans-serif"],
+        mono: ["'JetBrains Mono'", "'Geist Mono'", "ui-monospace", "SF Mono", "Menlo", "monospace"],
+      },
+      letterSpacing: {
+        "tight-xl": "-0.18em",
+        "tight-lg": "-0.032em",
+        "tight-md": "-0.025em",
+        "tight-sm": "-0.015em",
+        "eyebrow":  "0.03em",
+      },
+      spacing: {
+        xxs: "4px",
+        xs:  "8px",
+        sm:  "12px",
+        md:  "16px",
+        lg:  "24px",
+        xl:  "32px",
+        xxl: "48px",
+        section: "96px",
+      },
+    },
+  },
+  plugins: [],
+};
+
+export default config;