fix(app): apply layout segment config to pages

[NathanDrake2406]

Summary

• resolve App page segment config from the full matched layout -> page module chain instead of only route.page
• apply layout-level dynamic, revalidate, dynamicParams, and fetchCache to App page request handling
• keep codegen thin: the generated RSC entry lists route modules and delegates config reduction to server/app-segment-config

Next.js compatibility evidence

• Next.js collects App page segments from the route loader tree before reducing config: https://github.com/vercel/next.js/blob/canary/packages/next/src/build/segment-config/app/app-segments.ts#L86-L123
• Next.js reduces route config across collected segments, including dynamic, fetchCache, and shortest numeric revalidate: https://github.com/vercel/next.js/blob/canary/packages/next/src/build/utils.ts#L1001-L1041
• Next.js treats dynamicParams = false as effective if any generated segment disables dynamic params: https://github.com/vercel/next.js/blob/canary/packages/next/src/build/static-paths/app.ts#L907-L959

Tests

• vp test run tests/app-segment-config.test.ts tests/fetch-cache.test.ts tests/entry-templates.test.ts
• vp test run tests/app-router.test.ts -t "dynamicParams = false exported from a layout|revalidate exported from a layout|force-dynamic' exported from a layout"
• vp check packages/vinext/src/server/app-segment-config.ts packages/vinext/src/shims/fetch-cache.ts packages/vinext/src/shims/unified-request-context.ts packages/vinext/src/entries/app-rsc-entry.ts tests/app-segment-config.test.ts tests/fetch-cache.test.ts tests/app-router.test.ts

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commit: 1e54b39

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