fix(astro): expose types for @vercel/analytics/astro export (#169)

[VG31OP]

Summary

Fixes #169.

When importing @vercel/analytics/astro, TypeScript fails to resolve module declarations under TypeScript 4.7+ / 5.x resolution modes (moduleResolution: "bundler", "node16", or "nodenext"):

Cannot find module '@vercel/analytics/astro' or its corresponding type declarations.

Root Cause

1. In packages/web/package.json#exports["./astro"], only "import": "./dist/astro/component.ts" was provided, omitting the "types" export condition. TypeScript requires the "types" condition to be listed first for subpath imports.
2. In packages/web/package.json#typesVersions["*"], entries existed for next, nuxt, react, remix, server, sveltekit, and vue, but "astro" was missing.
3. Other subpath export conditions (./next, ./react, ./nuxt, ./remix, ./vue) were also missing explicit "types" conditions in exports, relying solely on fallback typesVersions.

Changes

• Added "types": "./dist/astro/component.ts" to exports["./astro"].
• Added "astro": ["dist/astro/component.ts"] to typesVersions["*"].
• Added explicit "types" conditions across all subpath export targets in packages/web/package.json.

Verification

• Tested with pnpm --filter astro build and astro check in apps/astro: @vercel/analytics/astro imports and resolves cleanly without type errors.
• Verified all existing vitest tests in packages/web pass (10/10 test files, 107/107 tests passing).
• Verified Biome checks pass with zero errors.

[vercel]

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