fix(seo): add sitemap reference to robots.txt, metadata to not-found and descriptions across public pages (#246, #247, #249, #250)

src/app/connect/page.tsx

@@ -2,6 +2,7 @@ import { ConnectPanel } from "./ConnectPanel";
 
 export const metadata = {
   title: "Connect | MergeFi",
+  description: "Connect your GitHub account and Stellar wallet to start claiming bounties or funding open source issues.",
 };
 
 export default function ConnectPage() {

src/app/issues/page.tsx

@@ -4,6 +4,7 @@ import { BountyCard } from "@/components/bounty/BountyCard";
 
 export const metadata = {
   title: "Paid Issues | MergeFi",
+  description: "Browse funded bounties backed by on-chain Soroban escrow on Stellar. Solve issues and earn USDC instantly upon merge.",
 };
 
 export default async function IssuesPage() {

src/app/milestones/page.tsx

@@ -5,6 +5,7 @@ import { MilestoneFundButton, PoolDepositButton } from "./MilestoneActions";
 
 export const metadata = {
   title: "Milestones | MergeFi",
+  description: "Fund entire open source milestones or maintenance pools with escrow-backed milestone budgets on Stellar.",
 };
 
 export default async function MilestonesPage() {

src/app/not-found.tsx

@@ -1,3 +1,7 @@
+export const metadata = {
+  title: "Page Not Found | MergeFi",
+};
+
 import Link from "next/link";
 import { Button } from "@/components/ui/Button";
 

src/app/robots.ts

@@ -1,10 +1,14 @@
 import type { MetadataRoute } from "next";
 
+const SITE_URL =
+  process.env.NEXT_PUBLIC_SITE_URL ?? "https://mergefi.org";
+
 export default function robots(): MetadataRoute.Robots {
   return {
     rules: {
       userAgent: "*",
       allow: "/",
     },
+    sitemap: `${SITE_URL}/sitemap.xml`,
   };
 }