feat(lsp): Add GraphQL LSP server support

[sandiiarov]

Summary

This PR adds GraphQL Language Server support to OpenCode, enabling IDE-like features (autocomplete, hover info, diagnostics, go-to-definition) for GraphQL projects.

Changes

• Auto-detection via .graphqlrc.* or graphql.config.* files
• Auto-installs when not found in system
• Supports, standalone files and inline GraphQL in .graphql, .gql, .ts, .tsx, .js, .jsx, .vue, .svelte, .astro files

Testing

Tested locally with:

• Opening and files in GraphQL projects
• Opening inline GraphQL in TypeScript/JavaScript/Vue files
• Verified LSP server spawns automatically when GraphQL config files are detected
• Checked diagnostics for invalid GraphQL syntax
• Tested autocomplete and hover information
• Confirmed coexistence with Biome LSP (no conflicts)

Fixes #9308