fix(doctor): prefer config dir for loaded plugin version

Check the OpenCode config install before the legacy cache install so doctor reports the actual loaded plugin version for bun-based installs.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/cli/doctor/checks/system-loaded-version.ts

@@ -5,7 +5,7 @@ import { join } from "node:path"
 import { getLatestVersion } from "../../../hooks/auto-update-checker/checker"
 import { extractChannel } from "../../../hooks/auto-update-checker"
 import { PACKAGE_NAME } from "../constants"
-import { getOpenCodeCacheDir, parseJsonc } from "../../../shared"
+import { getOpenCodeCacheDir, getOpenCodeConfigPaths, parseJsonc } from "../../../shared"
 
 interface PackageJsonShape {
   version?: string
@@ -54,9 +54,24 @@ function normalizeVersion(value: string | undefined): string | null {
 }
 
 export function getLoadedPluginVersion(): LoadedVersionInfo {
+  const configPaths = getOpenCodeConfigPaths({ binary: "opencode" })
   const cacheDir = resolveOpenCodeCacheDir()
-  const cachePackagePath = join(cacheDir, "package.json")
-  const installedPackagePath = join(cacheDir, "node_modules", PACKAGE_NAME, "package.json")
+  const candidates = [
+    {
+      cacheDir: configPaths.configDir,
+      cachePackagePath: configPaths.packageJson,
+      installedPackagePath: join(configPaths.configDir, "node_modules", PACKAGE_NAME, "package.json"),
+    },
+    {
+      cacheDir,
+      cachePackagePath: join(cacheDir, "package.json"),
+      installedPackagePath: join(cacheDir, "node_modules", PACKAGE_NAME, "package.json"),
+    },
+  ]
+
+  const selectedCandidate = candidates.find((candidate) => existsSync(candidate.installedPackagePath)) ?? candidates[0]
+
+  const { cacheDir: selectedDir, cachePackagePath, installedPackagePath } = selectedCandidate
 
   const cachePackage = readPackageJson(cachePackagePath)
   const installedPackage = readPackageJson(installedPackagePath)
@@ -65,7 +80,7 @@ export function getLoadedPluginVersion(): LoadedVersionInfo {
   const loadedVersion = normalizeVersion(installedPackage?.version)
 
   return {
-    cacheDir,
+    cacheDir: selectedDir,
     cachePackagePath,
     installedPackagePath,
     expectedVersion,