feat: remove legacy OpenCode runtime

Cut product flows over to Coding/Pi and retain only the migration-owned v1 boundary. Promote supported native optional packages because electron-builder omitted pnpm transitive optional closure from the packaged ASAR.

src/lib/ai-modules.ts

@@ -23,7 +23,7 @@ export const aiModules: readonly AiModuleDefinition[] = [
     title: 'Makelore Code',
     subtitle: 'AI 编程',
     description: '把创意编程变成可运行的产品、游戏或工具',
-    route: '/opencode-chat',
+    route: '/chat',
     enabled: true,
     Icon: Code2,
   },
@@ -72,9 +72,6 @@ const PROGRAMMING_ROUTE_PREFIXES = [
   '/chat',
   '/deliverables',
   '/workbench',
-  '/opencode-chat',
-  '/projects',
-  '/sessions',
   '/models',
 ] as const;