docs(js): enable Async Context page for all server platforms

Async context isolation applies to every server-side runtime, so replace the
partial pure-Node backend `supported` list with `supportedCategories:
[server]`. This adds the pages for the meta-frameworks, edge runtimes
(bun/deno/cloudflare), and serverless targets that were previously missing.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: mydea

docs/platforms/javascript/common/configuration/async-context.mdx

@@ -2,20 +2,8 @@
 title: Async Context
 sidebar_order: 80
 description: "Learn more about how to isolate Sentry scope and breadcrumbs across requests."
-supported:
-  - javascript.node
-  - javascript.eve
-  - javascript.mastra
-  - javascript.aws-lambda
-  - javascript.azure-functions
-  - javascript.connect
-  - javascript.express
-  - javascript.fastify
-  - javascript.gcp-functions
-  - javascript.hapi
-  - javascript.hono
-  - javascript.koa
-  - javascript.nestjs
+supportedCategories:
+  - server
 ---
 
 By default, the Sentry SDK will automatically isolate each request's scope and breadcrumbs. This means that any breadcrumbs or tags added will be isolated to the request. This is useful if you are finding that breadcrumbs and scope are leaking across requests. Take the following example: