Add auto-start incomplete tasks on application startup

[Copilot]

Implements automatic resumption of incomplete download tasks when the application launches, controlled via a user-configurable setting.

Changes

Configuration

• Added autoStartTasks boolean field to ExtraConfig (defaults to false)
• Field persists in user settings alongside other application preferences

Application Startup

• On launch, if autoStartTasks is enabled, calls continueAllTasks() API
• Leverages existing backend logic that respects maxRunning concurrency limits
• Only affects paused/waiting tasks; skips running and completed tasks

Settings UI

• Added toggle switch in Download settings section
• Follows existing pattern used for defaultDirectDownload and similar options

Localization

• Added translations for EN, CN (simplified/traditional), JP, DE, FR, ES, RU

Implementation Note

Frontend-only change. No Go backend modifications required—existing Continue() and continueAll() methods already handle task resumption with proper concurrency control.

// In main.dart initialization
if (controller.downloaderConfig.value.extra.autoStartTasks) {
  await api.continueAllTasks(null);  // Resumes all incomplete tasks
}

Original prompt

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This section details on the original issue you should resolve

<issue_title>添加打开软件自动开始未完成的任。</issue_title> <issue_description>RT</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes GopeedLab/gopeed#1198

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