Winget support added

[Aman071106]

PR Description

This PR implements the infrastructure required to package and publish API Dash to WinGet, including a professional Windows installer and an automated CI/CD pipeline (#549).

Changes Implemented

• Added Inno Setup Script: Created packaging/windows/apidash.iss to bundle the Flutter Windows build into a standard .exe installer (apidash-setup.exe).
• Automated CI/CD: Added a new GitHub Action (.github/workflows/winget-publish.yml) that triggers on release to:
  1. Build the Windows application.
  2. Compile the installer using Inno Setup.
  3. Upload the installer to release assets.
  4. Automatically submit the package to microsoft/winget-pkgs.
• Git Configuration: Updated .gitignore to explicitly allow tracking of the packaging/windows/ directory.
• Documentation: Updated doc/dev_guide/packaging.md with detailed steps for building the Windows installer locally and an overview of the WinGet automation.

Related Issues

Closes #549
Related to #240

Checklist

• I have gone through the contributing guide
• I have updated my branch and synced it with project main branch before making this PR
• I am using the latest Flutter stable branch (run flutter upgrade and verify)
• I have run the tests (flutter test) and all tests are passing

Added/updated tests?

• Yes
• No, and this is why: This PR involves CI/CD configuration and packaging scripts which were verified by manually generating the installer and running the build pipeline locally.

OS on which you have developed and tested the feature?

• Windows
• macOS
• Linux