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/SetupCoordinator.swift

@@ -36,7 +36,7 @@ final class SetupCoordinator: ObservableObject {
             message = ""
             return true
         } catch {
-            message = "本地代理初始化失败：\(error.localizedDescription)"
+            message = String(localized: "本地代理初始化失败：\(error.localizedDescription)")
             RuntimeLogger.error("APP", "Startup", "本地服务初始化失败", error: error)
             return false
         }
@@ -48,19 +48,19 @@ final class SetupCoordinator: ObservableObject {
         case .success:
             trustState = .trusted
             needsSetup = false
-            message = "✓ 定位环境正常"
+            message = String(localized: "✓ 定位环境正常")
         case .certNotTrusted:
             trustState = .unavailable
             setupStep = .cert
             needsSetup = true
-            message = "CA 证书未安装或未信任"
+            message = String(localized: "CA 证书未安装或未信任")
         case .verificationInProgress, .verificationSuperseded:
             break
         default:
             trustState = .unavailable
             setupStep = .proxy
             needsSetup = true
-            message = "Wi-Fi 代理未正确设置，请检查 127.0.0.1:8888"
+            message = String(localized: "Wi-Fi 代理未正确设置，请检查 127.0.0.1:8888")
         }
     }