feat: add auto-start incomplete tasks on application startup

[Copilot]

• Add autoStartTasks field to ExtraConfig in downloader_config.dart
• Add UI setting for autoStartTasks in setting_view.dart
• Implement auto-start logic in main.dart to continue incomplete tasks on startup
• Add translations (EN, CN, JP, TW, DE, FR, ES, RU)
• Address code review feedback
• Security scan passed
• Sync with upstream main branch and resolve conflicts
• Implementation complete

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 添加打开软件自动开始未完成的任。 #1198

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[ilteoood]

This is a great functionality @monkeyWie , can we see it on main soon?

[monkeyWie]

This is a great functionality @monkeyWie , can we see it on main soon?

Sure, it will be in the next version

[monkeyWie]

@copilot Sync to upstream and resolve conflicts

[Copilot]

@copilot Sync to upstream and resolve conflicts

Synced with upstream main branch and resolved conflicts in commit ec60f63. The conflict in setting_view.dart has been resolved by keeping both the autoStartTasks feature and the new archive extraction features from main.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.28%. Comparing base (24db9bb) to head (291cebc).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1203   +/-   ##
=======================================
  Coverage   70.28%   70.28%           
=======================================
  Files          48       48           
  Lines        5128     5128           
=======================================
  Hits         3604     3604           
  Misses       1168     1168           
  Partials      356      356           

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