feat: add bun-fullstack agent and update skills

.agent/skills/tech-stack/elysiajs/plugins/server-timing.md

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+# Server Timing Plugin
+This plugin adds support for auditing performance bottlenecks with Server Timing API
+
+## Installation
+```bash
+bun add @elysiajs/server-timing
+```
+
+## Basic Usage
+```typescript twoslash
+import { Elysia } from 'elysia'
+import { serverTiming } from '@elysiajs/server-timing'
+
+new Elysia()
+    .use(serverTiming())
+    .get('/', () => 'hello')
+    .listen(3000)
+```
+
+Server Timing then will append header 'Server-Timing' with log duration, function name, and detail for each life-cycle function.
+
+To inspect, open browser developer tools > Network > [Request made through Elysia server] > Timing.
+
+Now you can effortlessly audit the performance bottleneck of your server.
+
+## Config
+Below is a config which is accepted by the plugin
+
+### enabled
+@default `NODE_ENV !== 'production'`
+
+Determine whether or not Server Timing should be enabled
+
+### allow
+@default `undefined`
+
+A condition whether server timing should be log
+
+### trace
+@default `undefined`
+
+Allow Server Timing to log specified life-cycle events:
+
+Trace accepts objects of the following:
+- request: capture duration from request
+- parse: capture duration from parse
+- transform: capture duration from transform
+- beforeHandle: capture duration from beforeHandle
+- handle: capture duration from the handle
+- afterHandle: capture duration from afterHandle
+- total: capture total duration from start to finish
+
+## Pattern
+Below you can find the common patterns to use the plugin.
+
+## Allow Condition
+You may disable Server Timing on specific routes via `allow` property
+
+```ts twoslash
+import { Elysia } from 'elysia'
+import { serverTiming } from '@elysiajs/server-timing'
+
+new Elysia()
+    .use(
+        serverTiming({
+            allow: ({ request }) => {
+                return new URL(request.url).pathname !== '/no-trace'
+            }
+        })
+    )
+```