fix(web): externalize ao-core and better-sqlite3 from Next.js bundle

Fixes #1930.

Next.js bundles @aoagents/ao-core (via transpilePackages) and bakes
import.meta.url as the build machine's absolute path into the output.
At runtime on any other machine (especially Windows), createRequire()
receives a non-existent file:// URL and fails.

Adding @aoagents/ao-core and better-sqlite3 to serverExternalPackages
tells Next.js to not bundle these — they're resolved at runtime from
node_modules, so import.meta.url resolves to the actual install path.

This fixes:
- events-db.ts: createRequire(import.meta.url)("better-sqlite3")
- update-cache.ts: createRequire(fileURLToPath(import.meta.url))
- The Windows ERR_INVALID_ARG_VALUE error in the user report

packages/web/next.config.js

@@ -22,6 +22,8 @@ const nextConfig = {
   serverExternalPackages: [
     "yaml",
     "zod",
+    "@aoagents/ao-core",
+    "better-sqlite3",
   ],
   webpack: (config, { isServer }) => {
     if (process.platform === "win32") {