fix(build): externalize Next server packages

[NathanDrake2406]

Summary

• Add Next.js's default server-external package list and merge it with serverExternalPackages plus user ssr.external entries.
• Apply the shared externalization policy to Node Pages Router builds, App Router RSC/SSR builds, and App Router client optimizer excludes while preserving bundled Cloudflare/Nitro behavior.
• Port the relevant prerender-native-module Pages Router behavior with a local sqlite/sqlite3 fixture that proves native sqlite3 stays external and that prerendered/fallback routes render the same props contract.

Root Cause

Vinext forced most Node server dependencies through Vite with noExternal: true, only letting React and ipaddr.js escape in plain Pages Router builds. Packages like sqlite3 therefore got bundled into the ESM server entry, where CommonJS/native-loader code can retain __dirname and crash during build-time prerendering.

Next.js keeps a predefined server external package list and combines it with user serverExternalPackages; packages on that effective list are loaded natively instead of bundled.

References

• Upstream failing candidate: test/e2e/prerender-native-module.test.ts
• Next.js default external list: packages/next/src/lib/server-external-packages.jsonc
• Next.js merges defaults with serverExternalPackages: packages/next/src/build/webpack-config.ts
• Next.js Pages Router bundling opt-out behavior: packages/next/src/build/handle-externals.ts
• Next.js native/module external coverage for App Router: test/e2e/app-dir/server-components-externals/index.test.ts

Verification

• vp test run tests/build-optimization.test.ts --project unit -t "server packages"
• vp test run tests/nextjs-compat/prerender-native-module.test.ts --project integration
• vp check packages/vinext/src/index.ts packages/vinext/src/config/server-external-packages.ts tests/build-optimization.test.ts tests/nextjs-compat/prerender-native-module.test.ts
• vp env exec --node 24 ./scripts/run-nextjs-deploy-suite.sh /Users/nathan/Projects/vinext/.refs/nextjs-v16.2.6 --retries 0 -c 1 --debug test/e2e/prerender-native-module.test.ts

Pre-commit also ran staged checks, full check, staged unit/integration tests, and knip successfully.

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commit: efa6454