feat(lsp): sync with OpenCode LSP implementation
- Add 50+ extension mappings to EXT_TO_LANG (Clojure, Erlang, F#, Haskell, Scala, OCaml, etc.)
- Add missing BUILTIN_SERVERS: Biome, Oxlint, ty (Python), FSharp, Terraform-ls
- Improve isServerInstalled() to check node_modules/.bin, ~/.config/opencode/bin paths
- Add Windows .exe extension support for command detection
- Fix GitHub issue #118 - LSP servers not being detected
🤖 Generated with assistance of OhMyOpenCode (https://github.com/code-yeongyu/oh-my-opencode)
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