feat(moderation): add content reporting system (#561)

[Favourof]

Closes #561

Summary

This PR adds a user reporting system for inappropriate content and integrates reports into the moderation queue.

What changed

• Added POST /moderation/reports to let authenticated users report content
• Added report reasons:
  • spam
  • abuse
  • inappropriate
• Added persistent report tracking with:
  • reporter linkage
  • reviewer linkage
  • report status
  • moderation item linkage
  • timestamps
• Integrated new reports into the existing moderation queue
• Added moderation endpoints to:
  • list reports
  • fetch a report by ID
  • review a report as resolved or dismissed
• Updated Swagger tags and README documentation

Files touched

• src/moderation/reports/*
• src/moderation/moderation.module.ts
• src/moderation/manual/*
• src/app.module.ts
• src/main.ts
• README.md

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[RUKAYAT-CODER]

Kindly resolve conflict.

[RUKAYAT-CODER]

Thank you for contributing to the project.