refactor(doctor): show detected LSP servers and extensions instead of hardcoded counts

Replace the hardcoded 4-server list in doctor LSP check with getAllServers()
from server-resolution.ts, which covers all 40+ builtin servers plus user
config. Output now shows server count with supported extensions, and verbose
mode expands to per-server detail lines.

Status:  LSP 3 servers (.go, .py, .pyi, .ts, .tsx)
Verbose: LSP 3 servers (.go, .py, .pyi, .ts, .tsx)
           typescript (.ts, .tsx, .js, .jsx)
           pyright (.py, .pyi)
           gopls (.go)

Closes #2587

src/cli/doctor/format-default.test.ts

@@ -20,8 +20,7 @@ function createBaseResult(): DoctorResult {
       isLocalDev: false,
     },
     tools: {
-      lspInstalled: 0,
-      lspTotal: 0,
+      lspServers: [],
       astGrepCli: false,
       astGrepNapi: false,
       commentChecker: false,