fix(openclaw): address code review findings across P0-P3 issues

- Add 25 missing i18n keys for OpenClawFormFields in all 3 locales (P0)
- Replace key={index} with stable crypto.randomUUID() keys in EnvPanel,
  ToolsPanel, and OpenClawFormFields to prevent list state bugs (P1)
- Exclude openclaw from ProxyToggle/FailoverToggle in App.tsx (P1)
- Add merge_additive_config() for openclaw/opencode deep link imports (P1)
- Normalize serde(flatten) field naming to `extra` + HashMap (P2)
- Add directory existence check in remove_openclaw_provider_from_live (P2)
- Remove dead code in import_default_config and openclaw API methods (P2)
- Add duplicate key validation in EnvPanel before save (P2)
- Add openclawConfigDir to Settings type (P2)
- Add staleTime to OpenClaw query hooks (P3)
- Fix type-unsafe delete via destructuring in mutations.ts (P3)

src/types.ts

@@ -224,6 +224,8 @@ export interface Settings {
   geminiConfigDir?: string;
   // 覆盖 OpenCode 配置目录（可选）
   opencodeConfigDir?: string;
+  // 覆盖 OpenClaw 配置目录（可选）
+  openclawConfigDir?: string;
 
   // ===== 当前供应商 ID（设备级）=====
   // 当前 Claude 供应商 ID（优先于数据库 is_current）