Add changesets for the SSR request-pipeline URL-parsing perf change

Author: iseraph-dev

.changeset/reduce-ssr-url-parsing-adapters.md

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+---
+'@astrojs/node': patch
+'@astrojs/cloudflare': patch
+'@astrojs/netlify': patch
+'@astrojs/vercel': patch
+---
+
+Reduces per-request URL parsing in the SSR path by parsing `request.url` once and sharing it across `app.match()` and `app.render()` (previously parsed two to three times per request). This is an internal performance change with no behavior difference.

.changeset/reduce-ssr-url-parsing.md

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+---
+'astro': patch
+---
+
+Reduces per-request URL parsing and allocations in the SSR request pipeline, collapsing up to three `request.url` parses per request down to one across the core render and match paths. This is an internal performance change with no behavior difference.
+
+Note: `createRequestFromNodeRequest` (exported from `astro/app/node`) now returns `{ request, url }` instead of a bare `Request`. Astro's internal call sites are updated; external importers must destructure `.request`.