revert: restore full config overwrite + Common Config Snippet (revert 992dda5c)

Revert the partial key-field merging refactoring introduced in 992dda5c,
along with two dependent commits (24fa8a18, 87604b18) that referenced
the now-removed ClaudeQuickToggles component.

The whitelist-based partial merge approach had critical issues:
- Non-whitelisted custom fields were lost during provider switching
- Backfill permanently stripped non-key fields from the database
- Whitelist required constant maintenance to track upstream changes

This restores the proven "full config overwrite + Common Config Snippet"
architecture where each provider stores its complete configuration and
shared settings are managed via a separate snippet mechanism.

Reverted commits:
- 24fa8a18: context-aware JSON editor hint + hide quick toggles
- 87604b18: hide ClaudeQuickToggles when creating
- 992dda5c: partial key-field merging refactoring

Restored:
- Full config snapshot write (write_live_snapshot) for Claude/Codex/Gemini
- Full config backfill (settings_config = live_config)
- Common Config Snippet UI and backend commands
- 6 frontend components/hooks for common config editing
- configApi barrel export and DB snippet methods

Removed:
- ClaudeQuickToggles component
- write_live_partial / backfill_key_fields / patch_claude_live
- All KEY_FIELDS constants

src/lib/api/config.ts

@@ -0,0 +1,77 @@
+// 配置相关 API
+import { invoke } from "@tauri-apps/api/core";
+
+export type AppType = "claude" | "codex" | "gemini" | "omo" | "omo_slim";
+
+/**
+ * 获取 Claude 通用配置片段（已废弃，使用 getCommonConfigSnippet）
+ * @returns 通用配置片段（JSON 字符串），如果不存在则返回 null
+ * @deprecated 使用 getCommonConfigSnippet('claude') 替代
+ */
+export async function getClaudeCommonConfigSnippet(): Promise<string | null> {
+  return invoke<string | null>("get_claude_common_config_snippet");
+}
+
+/**
+ * 设置 Claude 通用配置片段（已废弃，使用 setCommonConfigSnippet）
+ * @param snippet - 通用配置片段（JSON 字符串）
+ * @throws 如果 JSON 格式无效
+ * @deprecated 使用 setCommonConfigSnippet('claude', snippet) 替代
+ */
+export async function setClaudeCommonConfigSnippet(
+  snippet: string,
+): Promise<void> {
+  return invoke("set_claude_common_config_snippet", { snippet });
+}
+
+/**
+ * 获取通用配置片段（统一接口）
+ * @param appType - 应用类型（claude/codex/gemini）
+ * @returns 通用配置片段（原始字符串），如果不存在则返回 null
+ */
+export async function getCommonConfigSnippet(
+  appType: AppType,
+): Promise<string | null> {
+  return invoke<string | null>("get_common_config_snippet", { appType });
+}
+
+/**
+ * 设置通用配置片段（统一接口）
+ * @param appType - 应用类型（claude/codex/gemini）
+ * @param snippet - 通用配置片段（原始字符串）
+ * @throws 如果格式无效（Claude/Gemini 验证 JSON，Codex 暂不验证）
+ */
+export async function setCommonConfigSnippet(
+  appType: AppType,
+  snippet: string,
+): Promise<void> {
+  return invoke("set_common_config_snippet", { appType, snippet });
+}
+
+/**
+ * 提取通用配置片段
+ *
+ * 默认读取当前激活供应商的配置；若传入 `options.settingsConfig`，则从编辑器当前内容提取。
+ * 会自动排除差异化字段（API Key、模型配置、端点等），返回可复用的通用配置片段。
+ *
+ * @param appType - 应用类型（claude/codex/gemini）
+ * @param options - 可选：提取来源
+ * @returns 提取的通用配置片段（JSON/TOML 字符串）
+ */
+export type ExtractCommonConfigSnippetOptions = {
+  settingsConfig?: string;
+};
+
+export async function extractCommonConfigSnippet(
+  appType: Exclude<AppType, "omo">,
+  options?: ExtractCommonConfigSnippetOptions,
+): Promise<string> {
+  const args: Record<string, unknown> = { appType };
+  const settingsConfig = options?.settingsConfig;
+
+  if (typeof settingsConfig === "string" && settingsConfig.trim()) {
+    args.settingsConfig = settingsConfig;
+  }
+
+  return invoke<string>("extract_common_config_snippet", args);
+}

src/lib/api/index.ts

@@ -11,5 +11,6 @@ export { proxyApi } from "./proxy";
 export { openclawApi } from "./openclaw";
 export { sessionsApi } from "./sessions";
 export { workspaceApi } from "./workspace";
+export * as configApi from "./config";
 export type { ProviderSwitchEvent } from "./providers";
 export type { Prompt } from "./prompts";