feat: 添加 Provider Registry、StatusLine、Cache Stats 和其他增强

- providerRegistry: OpenAI 兼容 provider 切换（Cerebras/Groq/DeepSeek/Qwen）
- StatusLine: 增强状态栏（缓存命中率、TTL 倒计时、自定义 shell 命令）
- cacheStats: 缓存命中率和 token 签名追踪
- ultrareviewPreflight: 代码审查预检服务
- SkillsMenu/filterSkills: 技能菜单过滤增强
- MagicDocs/langfuse prompts: 提示词更新
- claude.ts: API 客户端更新

Co-Authored-By: glm-5-turbo <zai-org@claude-code-best.win>

src/utils/config.ts

@@ -222,6 +222,12 @@ export type GlobalConfig = {
     rejected?: string[]
   }
   primaryApiKey?: string // Primary API key for the user when no environment variable is set, set via oauth (TODO: rename)
+  /**
+   * Workspace API key saved via /login UI (sk-ant-api03-*).
+   * Stored in plaintext — file should be gitignored and chmod 600.
+   * ANTHROPIC_API_KEY env var takes precedence when both are present.
+   */
+  workspaceApiKey?: string
   hasAcknowledgedCostThreshold?: boolean
   hasSeenUndercoverAutoNotice?: boolean // ant-only: whether the one-time auto-undercover explainer has been shown
   hasSeenUltraplanTerms?: boolean // ant-only: whether the one-time CCR terms notice has been shown in the ultraplan launch dialog