fix(servers): number existing duplicate names

GLOSSARY.md

@@ -29,7 +29,7 @@ _避免用词_：导出（导出指配置组或诊断报告等文件快照）。
 把剪贴板文本或文件中的服务器配置引入配置目录、形成独立手动子树的操作。来源资料中的标识只用于装配其内部结构，导入产生的每个节点都获得全新的本地持久身份；同一资料重复导入产生相互独立的服务器配置，不与既有节点合并或去重。
 
 **节点复制（Node duplication）**：
-在原节点之后的同级位置创建独立手动副本。组复制包含整棵子树，保留层级、顺序、连接字段和空组；所有节点身份及凭据引用重新生成。支持手动服务器、手动组和根层订阅组，不支持订阅服务器或嵌套订阅子组。订阅副本不携带订阅来源资料；顶层副本名称加本地化后缀并在同级重名时追加序号。目录和凭据作为一次逻辑变更提交，失败不发布部分子树，凭据回滚不完整时必须报告。复制不切换活动目标；在活动组内新增的副本按普通目录变更进入运行时收敛。
+在原节点之后的同级位置创建独立手动副本。组复制包含整棵子树，保留层级、顺序、连接字段和空组；所有节点身份及凭据引用重新生成。支持手动服务器、手动组和根层订阅组，不支持订阅服务器或嵌套订阅子组。订阅副本不携带订阅来源资料；顶层副本名称加本地化后缀并在同级重名时追加序号；名称末尾已有“副本”或“Copy”（含编号）时沿用该后缀，以同级未占用的编号命名，避免重复追加后缀。目录和凭据作为一次逻辑变更提交，失败不发布部分子树，凭据回滚不完整时必须报告。复制不切换活动目标；在活动组内新增的副本按普通目录变更进入运行时收敛。
 
 **导入来源（Import source）**：
 一次服务器导入中可独立处理的一份资料，例如剪贴板文本或单个文件。每个来源独立解码、独立提交，是成功、部分成功与失败报告的粒度单位；一个来源失败不影响其他来源。

ShadowsocksX-NG2/App/Application/CatalogWorkflow/CatalogWorkflow+Duplicate.swift

@@ -17,9 +17,18 @@ extension CatalogWorkflow {
     let siblings = try source.children(of: parent)
     guard let position = siblings.firstIndex(of: id) else { throw CatalogError.nodeNotFound(id) }
     let names = Set(siblings.compactMap { source.entry(for: $0)?.displayName })
-    let base = "\(entry.displayName) \(nameSuffix)"
+    var base = "\(entry.displayName) \(nameSuffix)"
     var name = base
     var number = 2
+    // 两种语言的已保存后缀都识别，切换语言后仍沿用原名称的复制序列。
+    if let suffixRange = entry.displayName.range(
+      of: #" (?:副本|Copy)(?: [0-9]+)?$"#, options: .regularExpression)
+    {
+      let suffix = entry.displayName[suffixRange].split(separator: " ")[0]
+      base = "\(entry.displayName[..<suffixRange.lowerBound]) \(suffix)"
+      name = "\(base) 2"
+      number = 3
+    }
     while names.contains(name) {
       name = "\(base) \(number)"
       number += 1

ShadowsocksX-NG2/Tests/Catalog/Workflow/CatalogWorkflowDuplicateTests.swift

@@ -127,6 +127,28 @@ struct CatalogWorkflowDuplicateTests {
     #expect(fixture.runtime.convergeSnapshots.last?.catalog.rootChildren == [original, copy])
   }
 
+  @Test(arguments: ["副本", "Copy"])
+  func copyingCopiesUsesOneSuffixAndSiblingNumbers(suffix: String) async throws {
+    let fixture = try DuplicateFixture()
+    let workflow = fixture.workflow
+    let original = try await workflow.createGroup(named: "websocket", into: nil)
+    let first = try await workflow.duplicate(original, nameSuffix: suffix)
+    let second = try await workflow.duplicate(first, nameSuffix: suffix)
+    let third = try await workflow.duplicate(second, nameSuffix: suffix)
+    #expect(workflow.displayName(for: first) == "websocket \(suffix)")
+    #expect(workflow.displayName(for: second) == "websocket \(suffix) 2")
+    #expect(workflow.displayName(for: third) == "websocket \(suffix) 3")
+    let otherSuffix = suffix == "Copy" ? "副本" : "Copy"
+    let fourth = try await workflow.duplicate(third, nameSuffix: otherSuffix)
+    #expect(workflow.displayName(for: fourth) == "websocket \(suffix) 4")
+    let detached = try await workflow.createGroup(named: "Detached \(suffix) 2", into: nil)
+    let detachedCopy = try await workflow.duplicate(detached, nameSuffix: suffix)
+    #expect(workflow.displayName(for: detachedCopy) == "Detached \(suffix) 3")
+    let interior = try await workflow.createGroup(named: "websocket \(suffix) backup", into: nil)
+    let interiorCopy = try await workflow.duplicate(interior, nameSuffix: suffix)
+    #expect(workflow.displayName(for: interiorCopy) == "websocket \(suffix) backup \(suffix)")
+  }
+
   @Test func serverCopyIsAdjacentAndIndependent() async throws {
     let fixture = try DuplicateFixture()
     let workflow = fixture.workflow