Add basic-server-* examples for Vue, Svelte, Preact, and Solid (#141)

* Add basic-server-vue example

Demonstrates MCP App SDK usage with Vue 3, providing framework
parity alongside the existing React and vanilla JS examples.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Add basic-server-svelte example

Demonstrates MCP App SDK usage with Svelte, providing parity
with the existing basic-server-react and basic-server-vue examples.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Add basic-server-preact example

Demonstrates MCP App SDK usage with Preact, providing another
lightweight framework option alongside the existing React, Vue,
and Svelte examples.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Add basic-server-solid example

Demonstrates MCP App SDK usage with Solid.js, providing another
reactive framework option alongside the existing React, Vue,
Svelte, and Preact examples.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Add framework GitHub links to README

Link each framework name to its official GitHub repo in basic examples
list.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

examples/basic-server-solid/src/global.css

@@ -0,0 +1,12 @@
+* {
+  box-sizing: border-box;
+}
+
+html, body {
+  font-family: system-ui, -apple-system, sans-serif;
+  font-size: 1rem;
+}
+
+code {
+  font-size: 1em;
+}