feat: implement task patching functionality

[monkeyWie]

Fixed: #1223 #658

• Added Patch method in Downloader to modify task-specific data.
• Introduced PatchTask API endpoint to handle patch requests.
• Created tests for patching tasks, including success and not found scenarios.
• Updated Flutter UI to support pending URL updates and user prompts for task updates.
• Enhanced HTTP header management in the UI for task updates.
• Added new translations for update-related UI elements.

[codecov]

Codecov Report

❌ Patch coverage is 76.66667% with 35 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.78%. Comparing base (6de63c3) to head (5858fb9).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/download/downloader.go	36.84%	9 Missing and 3 partials ⚠️
internal/protocol/http/fetcher.go	67.74%	5 Missing and 5 partials ⚠️
pkg/rest/api.go	66.66%	4 Missing and 1 partial ⚠️
internal/test/httptest.go	91.66%	3 Missing and 1 partial ⚠️
internal/protocol/bt/fetcher.go	88.46%	1 Missing and 2 partials ⚠️
pkg/base/model.go	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1267      +/-   ##
==========================================
+ Coverage   73.69%   73.78%   +0.08%     
==========================================
  Files          47       47              
  Lines        5973     6110     +137     
==========================================
+ Hits         4402     4508     +106     
- Misses       1165     1186      +21     
- Partials      406      416      +10     

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