feat: http proxy

[lollipopkit]

Fixes #181

Summary by Sourcery

Enhancements:

• Refactors the profile settings page to use an ExpandTile widget for better organization and adds a ChoiceWidget for switching between profiles.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request refactors the profile settings UI to use an ExpandTile widget, enables system proxy settings for HTTP requests, and updates the fl_lib dependency to the latest version.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Refactored the profile settings UI to use an ExpandTile widget for a more organized and user-friendly interface.	Replaced ListTile with ExpandTile to allow expanding and collapsing the profile settings. Moved profile actions (Delete, Rename, Add) into a separate _buildSwitchCfgActions widget. Added a ChoiceWidget to display and switch between available profiles. Set initiallyExpanded to true on the ExpandTile to have the profile settings expanded by default.	lib/view/page/settings/profile.dart
Enabled system proxy settings for HTTP requests.	Added ProxyHttpOverrides.useSystemProxy() to the _initApp() function in main.dart.	lib/main.dart
Updated the fl_lib dependency to the latest version.	Updated the fl_lib dependency version from v1.0.244 to v1.0.251 in pubspec.yaml.	pubspec.yaml

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#181	Enable the desktop application to connect to a custom HTTP or SOCKS5 proxy.	✅

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[sourcery-ai]

Hey @lollipopkit - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider extracting the logic within _buildSwitchCfgActions to a separate widget for better readability.
• The ChoiceWidget could be made more generic to handle different types of items, not just ChatConfig.

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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