Add English localization (device-language based)

Add English as an overlay localization following the device language,
keeping Simplified Chinese as the base/development language. Untranslated
strings fall back to Chinese automatically.

- project.yml: set developmentLanguage zh-Hans and knownRegions (zh-Hans/en/Base)
- Resources/en.lproj/{Localizable,InfoPlist}.strings: ~230 English strings
- Resources/zh-Hans.lproj/InfoPlist.strings: Chinese permission prompts
- Restructure ternary Text/Label and String-typed UI messages so they
  localize (String(localized:), LocalizedStringKey helper params); replace
  a .contains("通过") success check with a dedicated flag
- Localize user-facing model/coordinator/error messages across App and Shared

Internal RuntimeLogger logs and diagnostic/report bodies remain in Chinese.

App/ProxyManager.swift

@@ -154,13 +154,13 @@ final class ProxyManager: ObservableObject {
         do {
             if !isRunning { try await start() }
             guard let url = URL(string: "http://127.0.0.1:8888/cert") else {
-                error = "证书下载地址无效"
+                error = String(localized: "证书下载地址无效")
                 return nil
             }
             error = nil
             return url
         } catch {
-            self.error = "启动代理失败: \(error.localizedDescription)"
+            self.error = String(localized: "启动代理失败: \(error.localizedDescription)")
             RuntimeLogger.error("APP", "Certificate", "准备证书下载失败", error: error)
             return nil
         }