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)

assets/oh-my-opencode.schema.json

@@ -1220,6 +1220,14 @@
         },
         "auto_resume": {
           "type": "boolean"
+        },
+        "preemptive_compaction": {
+          "type": "boolean"
+        },
+        "preemptive_compaction_threshold": {
+          "type": "number",
+          "minimum": 0.5,
+          "maximum": 0.95
         }
       }
     },