feat(admin): add secure moderation dashboard with analytics and moderation actions

[Harshit-Maurya838]

Description

Implemented a secure admin moderation dashboard for reviewing flagged content, monitoring moderation trends, and managing user violations.

This feature introduces a dedicated /admin/moderation page with role-based protection, moderation analytics, and actionable moderation controls for administrators.

Key Features

• Added secure admin-only route protection using requireAdmin()
• Implemented moderation analytics charts using Recharts
• Added moderation logs table with status badges and moderation actions
• Added support for:
  • Dismiss Flag
  • Warn User
  • Block User
• Added moderation status tracking (pending, dismissed, warned, blocked)
• Improved dashboard UI consistency with responsive chart cards and dark mode support
• Added backend APIs for moderation analytics and moderation actions
• Added proper empty states and pagination handling

Related Issue

Closes #188

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Documentation update (README, guides, comments)
• Style / UI change (no logic change)
• Code refactor (no behavior change)
• Test addition or update
• Breaking change (fix or feature that would cause existing functionality to change)

Screenshots (if UI change)

Before	After
Previous moderation system had no admin dashboard or analytics view	Added full moderation dashboard with charts, moderation table, and admin actions

How Has This Been Tested?

• Tested locally with npm run dev
• Verified on mobile viewport (375px)
• Verified on desktop viewport (1440px)

Checklist

• I have tested my changes locally (npm run dev)
• My code follows the existing code style (TypeScript, Tailwind, no any types)
• I have not introduced unrelated changes (each PR should address one issue)
• I have added comments where necessary
• My branch is up to date with main
• I have linked the related issue above
• Screenshots are included (if this is a UI change)

[vercel]

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[Harshit-Maurya838]

@knoxiboy Please review this PR and I Starred this Repo also

[knoxiboy]

Automated review: Thank you for starring the repository! The PR is approved.