feat: add Chinese UI, Responses models, and mirrored Windows setup

Localize the web console and persist custom model and capability settings.
Use OpenAI Responses exclusively and move runtime limits into environment configuration.
Bootstrap uv and the virtual environment on Windows, support optional China mirrors,
and package source distributions without environments, build output, or credentials.

Update regression tests and repository quality checks for the new behavior.

apps/showcase_ui/src/app/components/model-settings/capability-settings.component.ts

@@ -0,0 +1,54 @@
+import { Component, inject, OnInit, signal, output } from '@angular/core';
+import { FormsModule } from '@angular/forms';
+import { HttpClient } from '@angular/common/http';
+import { finalize } from 'rxjs';
+
+interface Capabilities {
+  video_enabled: boolean;
+  outputter_enabled: boolean;
+  step_summarizer_enabled: boolean;
+}
+
+@Component({
+  selector: 'app-capability-settings', standalone: true, imports: [FormsModule],
+  template: `
+    <section aria-label="功能开关">
+      <h3>功能开关</h3>
+      <p>按需启用，保存后对新任务生效。</p>
+      <label><input type="checkbox" role="switch" [(ngModel)]="config.video_enabled" [disabled]="busy() || loading() || !loaded()" />
+        <span>视频分析与录屏<small>录制设备画面，并允许智能体分析录像；关闭可减少资源占用。</small></span></label>
+      <label><input type="checkbox" role="switch" [(ngModel)]="config.outputter_enabled" [disabled]="busy() || loading() || !loaded()" />
+        <span>最终报告生成<small>根据执行记录生成任务结果报告。</small></span></label>
+      <label><input type="checkbox" role="switch" [(ngModel)]="config.step_summarizer_enabled" [disabled]="busy() || loading() || !loaded()" />
+        <span>步骤摘要压缩<small>Flash 模式下在后台生成摘要，减少长任务的上下文占用。</small></span></label>
+      <button type="button" (click)="save()" [disabled]="busy() || loading() || !loaded()">{{ busy() ? '正在保存…' : '保存功能设置' }}</button>
+      @if (message()) { <p role="status">{{ message() }}</p> }
+      @if (error()) { <p role="alert" class="error">{{ error() }}</p> }
+    </section>
+  `,
+  styles: [`section { margin-top: 24px; padding-top: 20px; border-top: 1px solid #64748b55; }
+    h3 { margin: 0 0 8px; } p, small { color: #64748b; line-height: 1.6; }
+    label { display: flex; gap: 12px; align-items: flex-start; padding: 14px 0; cursor: pointer; }
+    input { width: 20px; height: 20px; accent-color: #0284c7; flex-shrink: 0; }
+    small { display: block; margin-top: 4px; } button { padding: 10px 18px; border-radius: 10px; border: 1px solid #38bdf877; background: #0284c7; color: white; font: inherit; cursor: pointer; }
+    button:disabled { opacity: .5; cursor: default; } .error { color: #be123c; }`]
+})
+export class CapabilitySettingsComponent implements OnInit {
+  changed = output<Capabilities>();
+  private http = inject(HttpClient);
+  config: Capabilities = { video_enabled: true, outputter_enabled: true, step_summarizer_enabled: true };
+  busy = signal(false); loading = signal(true); loaded = signal(false); message = signal(''); error = signal('');
+  ngOnInit(): void {
+    this.http.get<Capabilities>('/api/system/capability-settings').pipe(finalize(() => this.loading.set(false))).subscribe({
+      next: config => { this.config = config; this.loaded.set(true); this.changed.emit(config); }, error: () => this.error.set('功能配置加载失败，请刷新页面重试。')
+    });
+  }
+  save(): void {
+    if (this.busy() || this.loading() || !this.loaded()) return;
+    this.busy.set(true); this.message.set(''); this.error.set('');
+    this.http.post<Capabilities>('/api/system/capability-settings', this.config).pipe(finalize(() => this.busy.set(false))).subscribe({
+      next: config => { this.config = config; this.changed.emit(config); this.message.set('功能设置已保存，新任务将使用此配置。'); },
+      error: () => this.error.set('保存失败，请检查服务器连接和 .env 文件权限。')
+    });
+  }
+}