refactor(main): split main.ts into focused runtime modules (#123)

src/main/runtime/first-run-setup-plugin.ts

@@ -180,6 +180,21 @@ export function detectInstalledFirstRunPluginCandidates(options: {
   return candidates;
 }
 
+export function detectWindowsMpvPluginRemovalCandidates(options: {
+  homeDir: string;
+  appDataDir: string;
+  mpvExecutablePath: string;
+  existsSync?: (candidate: string) => boolean;
+}): InstalledFirstRunPluginCandidate[] {
+  return detectInstalledFirstRunPluginCandidates({
+    platform: 'win32',
+    homeDir: options.homeDir,
+    appDataDir: options.appDataDir,
+    mpvExecutablePath: options.mpvExecutablePath,
+    existsSync: options.existsSync,
+  });
+}
+
 function parseInstalledPluginVersion(content: string): string | null {
   const match = content.match(/\bversion\s*=\s*["']([^"']+)["']/);
   return match?.[1] ?? null;