feat: integrate Sentry error tracking

- @sentry/nextjs installed and configured for client, server, and edge
- Instrumentation hook registers Sentry on Node.js and edge runtimes
- Global error boundary captures unhandled errors to Sentry
- next.config.ts wrapped with withSentryConfig (source maps disabled)
- No-op when NEXT_PUBLIC_SENTRY_DSN is not set

To enable: set NEXT_PUBLIC_SENTRY_DSN in .env.local or .env.production

Co-Authored-By: claude-flow <ruv@ruv.net>

apps/web/next.config.ts

@@ -1,5 +1,6 @@
 import path from "path";
 import type { NextConfig } from "next";
+import { withSentryConfig } from "@sentry/nextjs";
 
 const nextConfig: NextConfig = {
   output: "standalone",
@@ -44,4 +45,10 @@ const nextConfig: NextConfig = {
   },
 };
 
-export default nextConfig;
+export default withSentryConfig(nextConfig, {
+  silent: true,
+  sourcemaps: {
+    disable: true,
+  },
+  telemetry: false,
+});