chore(deps): upgrade Go, Node.js, React and build tools

[jplanckeel]

• Upgrade Go from 1.25.4 to 1.26.1 in Dockerfile and go.mod
• Upgrade Node.js from 20 to 24 in Dockerfile
• Upgrade React from 18 to 19 with corresponding type definitions
• Upgrade Vite from 7.2.2 to 8.0.3
• Upgrade @vitejs/plugin-react from 4.3.3 to 6.0.1
• Update documentation to reflect new Go 1.26+ and Node.js 24+ requirements
• Simplify backend development workflow by replacing air with direct go run command
• Remove air installation from setup task as it's no longer needed
• Update README badges to reflect Go 1.26+ and React 19 versions

Description

Please include a summary of the changes and the related issue. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes # (issue)

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Test A
• Test B

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules