feat(provider): use live config for edit and backfill SSOT after switch

- Edit modal (Claude+Codex): when editing the current provider, initialize form from live files (Claude: ~/.claude/settings.json; Codex: ~/.codex/auth.json + ~/.codex/config.toml) instead of SSOT.
- Switch (Claude): after writing live settings.json for the target provider, read it back and update the provider’s SSOT to match live.
- Switch (Codex): keep MCP sync to config.toml, then read back TOML and update the target provider’s SSOT (preserves mcp.servers/mcp_servers schema).
- Add Tauri command read_live_provider_settings for both apps, register handler, and expose window.api.getLiveProviderSettings.
- Types updated accordingly; cargo check and pnpm typecheck pass.

src/components/EditProviderModal.tsx

@@ -1,4 +1,4 @@
-import React from "react";
+import React, { useEffect, useState } from "react";
 import { useTranslation } from "react-i18next";
 import { Provider } from "../types";
 import { AppType } from "../lib/tauri-api";
@@ -18,6 +18,31 @@ const EditProviderModal: React.FC<EditProviderModalProps> = ({
   onClose,
 }) => {
   const { t } = useTranslation();
+  const [effectiveProvider, setEffectiveProvider] = useState<Provider>(provider);
+
+  // 若为当前应用且正在编辑“当前供应商”，则优先读取 live 配置作为初始值（Claude/Codex 均适用）
+  useEffect(() => {
+    let mounted = true;
+    const maybeLoadLive = async () => {
+      try {
+        const currentId = await window.api.getCurrentProvider(appType);
+        if (currentId && currentId === provider.id) {
+          const live = await window.api.getLiveProviderSettings(appType);
+          if (!mounted) return;
+          setEffectiveProvider({ ...provider, settingsConfig: live });
+        } else {
+          setEffectiveProvider(provider);
+        }
+      } catch (e) {
+        // 读取失败则回退到原 provider
+        setEffectiveProvider(provider);
+      }
+    };
+    maybeLoadLive();
+    return () => {
+      mounted = false;
+    };
+  }, [appType, provider]);
 
   const handleSubmit = (data: Omit<Provider, "id">) => {
     onSave({
@@ -31,7 +56,7 @@ const EditProviderModal: React.FC<EditProviderModalProps> = ({
       appType={appType}
       title={t("common.edit")}
       submitText={t("common.save")}
-      initialData={provider}
+      initialData={effectiveProvider}
       showPresets={false}
       onSubmit={handleSubmit}
       onClose={onClose}