docs: Update Contribution Guidelines & architecture documentation with accurate component details

[vinay22573]

What type of PR is this? (check all applicable)

• 📕 Documentation

Description

This PR updates the architecture documentation to accurately reflect the current codebase structure. The changes include:

1. Component Details Update

   • Added missing frontend components (Fields, PlotSpectra, Header, InfoPopover, DownloadButtons)
   • Updated backend component structure to match actual directory organization
   • Made component descriptions more specific and accurate

2. Documentation Improvements

   • Added more detailed component roles and responsibilities
   • Improved clarity of component relationships
   • Ensured documentation matches actual implementation

Checklist

• I have read the contribution guidelines
• I have tested these changes locally
• I have updated the documentation
• The changes follow the project's coding standards

Impact

These changes improve the accuracy and completeness of the architecture documentation, making it easier for:

• New contributors to understand the codebase structure
• Developers to locate specific components
• Maintainers to track component relationships

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