perf: optimize app startup and background lifecycles

tests/unit/host-api-dispatcher.test.ts

@@ -0,0 +1,32 @@
+import { describe, expect, it } from 'vitest';
+import { dispatchHostApiRequest } from '@electron/api/host-api-dispatcher';
+import { shouldUseLoopbackHostApi } from '@electron/api/host-api-transport';
+
+describe('Host API transport selection', () => {
+  it('keeps long-lived and binary responses on loopback HTTP', () => {
+    expect(shouldUseLoopbackHostApi('/api/events')).toBe(true);
+    expect(shouldUseLoopbackHostApi('/api/events?token=session')).toBe(true);
+    expect(shouldUseLoopbackHostApi('/api/opencode/events')).toBe(true);
+    expect(shouldUseLoopbackHostApi('/api/ai-proxy/v1/chat/completions', 'POST')).toBe(true);
+    expect(shouldUseLoopbackHostApi('/api/image-workspace/workspaces/w1/conversations/c1/events')).toBe(true);
+    expect(shouldUseLoopbackHostApi('/api/image-workspace/workspaces/w1/assets/a1/content?download=1')).toBe(true);
+  });
+
+  it('dispatches JSON and control requests in Main', () => {
+    expect(shouldUseLoopbackHostApi('/api/app/runtime-info')).toBe(false);
+    expect(shouldUseLoopbackHostApi('/api/works/projects/release-jobs', 'POST')).toBe(false);
+    expect(shouldUseLoopbackHostApi('/api/opencode/status')).toBe(false);
+  });
+
+  it('reuses the existing route contract without opening a socket', async () => {
+    const data = await dispatchHostApiRequest({
+      opencodeManager: { getStatus: () => ({ state: 'stopped', port: null }) },
+      opencodeProjectStore: {},
+      eventBus: {},
+      mainWindow: null,
+    } as never, { path: '/api/app/runtime-info' });
+
+    expect(data).toMatchObject({ status: 200, ok: true });
+    expect(data.json).toMatchObject({ runtime: 'opencode', status: { state: 'stopped' } });
+  });
+});