feat: 完成 TraceMemo v2.2.0 品牌身份与数据迁移升级

- 将 WechatExplorer 产品身份升级为 TraceMemo
- 更新 appId、Runtime Identity、Reader Skill 和 API 环境变量
- 增加旧用户数据、Knowledge、Token 与 AI Provider 安全迁移
- 保留 Windows WeFlow 和旧版配置兼容
- 完善首次启动迁移测试及 v2.2.0 发布文档
- 移除 macOS Intel x64 构建与发布支持

services/wechat-connector/ilink/auth_test.go

@@ -1,6 +1,7 @@
 package ilink
 
 import (
+	"encoding/json"
 	"os"
 	"path/filepath"
 	"testing"
@@ -34,3 +35,46 @@ func TestSaveCredentialsKeepsOnlyLatestAccount(t *testing.T) {
 		t.Fatalf("old sync state still exists: %v", err)
 	}
 }
+
+func TestAccountsDirUsesTraceMemoIdentity(t *testing.T) {
+	home := t.TempDir()
+	t.Setenv("HOME", home)
+	dir, err := AccountsDir()
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := filepath.Join(home, ".tracememo", "wechat-connector", "accounts")
+	if dir != want {
+		t.Fatalf("AccountsDir() = %q, want %q", dir, want)
+	}
+}
+
+func TestLoadAllCredentialsFallsBackToLegacyDirectory(t *testing.T) {
+	home := t.TempDir()
+	t.Setenv("HOME", home)
+	legacyDir, err := LegacyAccountsDir()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := os.MkdirAll(legacyDir, 0o700); err != nil {
+		t.Fatal(err)
+	}
+	legacy := &Credentials{ILinkBotID: "legacy@im.bot", BotToken: "legacy-token"}
+	data, err := json.Marshal(legacy)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(filepath.Join(legacyDir, NormalizeAccountID(legacy.ILinkBotID)+".json"), data, 0o600); err != nil {
+		t.Fatal(err)
+	}
+	accounts, err := LoadAllCredentials()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(accounts) != 1 || accounts[0].BotToken != legacy.BotToken {
+		t.Fatalf("accounts = %#v", accounts)
+	}
+	if _, err := os.Stat(legacyDir); err != nil {
+		t.Fatalf("legacy directory changed or removed: %v", err)
+	}
+}