Add SEO/GEO metadata: sitemap, robots.txt, manifest, and apple-icon (#2)

- app/sitemap.ts: Dynamic sitemap for public pages (/, /privacy, /terms)
- app/robots.ts: Robots.txt allowing public pages, disallowing auth/admin/api routes
- app/manifest.ts: Web App Manifest for PWA support with brand icons and theme color
- app/apple-icon.tsx: 180x180 Apple touch icon matching the existing favicon style

https://claude.ai/code/session_01BeZ2aVShBK6KnCi1tjRmkS

Co-authored-by: Claude <noreply@anthropic.com>

Author: callicles

app/apple-icon.tsx

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+import { ImageResponse } from "next/og"
+
+export const size = {
+  width: 180,
+  height: 180,
+}
+
+export const contentType = "image/png"
+
+export default function AppleIcon() {
+  return new ImageResponse(
+    <div
+      style={{
+        display: "flex",
+        width: "100%",
+        height: "100%",
+        borderRadius: 40,
+        alignItems: "center",
+        justifyContent: "center",
+        fontSize: 110,
+        fontWeight: 700,
+        background: "linear-gradient(135deg, #1fbf95, #45e1b8)",
+        color: "#041018",
+        fontFamily: "Arial",
+      }}
+    >
+      C
+    </div>,
+    {
+      ...size,
+    }
+  )
+}

app/manifest.ts

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+import type { MetadataRoute } from "next"
+
+export default function manifest(): MetadataRoute.Manifest {
+  return {
+    name: "CLA Bot by fiveonefour",
+    short_name: "CLA Bot",
+    description:
+      "Automate Contributor License Agreements for your GitHub organization. Install the GitHub App, upload your CLA in Markdown, and automatically check every pull request.",
+    start_url: "/",
+    display: "standalone",
+    background_color: "#041018",
+    theme_color: "#1fbf95",
+    icons: [
+      {
+        src: "/brand/cla-bot-github-app-logo-512.png",
+        sizes: "512x512",
+        type: "image/png",
+        purpose: "any",
+      },
+      {
+        src: "/brand/cla-bot-github-app-logo-512.png",
+        sizes: "512x512",
+        type: "image/png",
+        purpose: "maskable",
+      },
+      {
+        src: "/brand/cla-bot-github-app-logo.png",
+        sizes: "1024x1024",
+        type: "image/png",
+        purpose: "any",
+      },
+    ],
+  }
+}

app/robots.ts

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+import type { MetadataRoute } from "next"
+
+const BASE_URL = "https://cla.fiveonefour.com"
+
+export default function robots(): MetadataRoute.Robots {
+  return {
+    rules: [
+      {
+        userAgent: "*",
+        allow: ["/", "/privacy", "/terms"],
+        disallow: ["/admin/", "/contributor/", "/dashboard/", "/auth/", "/api/", "/sign/"],
+      },
+    ],
+    sitemap: `${BASE_URL}/sitemap.xml`,
+  }
+}

app/sitemap.ts

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+import type { MetadataRoute } from "next"
+
+const BASE_URL = "https://cla.fiveonefour.com"
+
+export default function sitemap(): MetadataRoute.Sitemap {
+  return [
+    {
+      url: BASE_URL,
+      lastModified: new Date(),
+      changeFrequency: "weekly",
+      priority: 1,
+    },
+    {
+      url: `${BASE_URL}/privacy`,
+      lastModified: new Date(),
+      changeFrequency: "monthly",
+      priority: 0.5,
+    },
+    {
+      url: `${BASE_URL}/terms`,
+      lastModified: new Date(),
+      changeFrequency: "monthly",
+      priority: 0.5,
+    },
+  ]
+}