feat: Topics, Custom Feeds, and General Reporting System

[MrPunyapal]

Description

This PR introduces a structured content classification and discovery architecture:

1. Topics System

• Topic Model & Migrations: Introduced \Topic\ with fields for slug, description, discovery status, and system topic distinction.
• Single-Topic Classification: Top-level posts require a topic (\ opic_id\ foreign key on questions).
• On-the-fly Topic Creation: Authors can dynamically select or create topics with instantaneous slugification.
• Topic Feeds & Discovery: Explore discoverable topics with search filtering, follower tracking, and trending/recent sorting.

2. Custom Feeds System

• Custom Feeds: Users can compose custom feeds bundling multiple topics and people.
• Visibility Controls: Support for \public\ and \private\ visibility.
• Following Feeds: Users can follow and explore community-curated feeds.

3. General Reporting & Moderation

• General Report Modal: Unified reporting system supporting spam, harassment, inappropriate content, and wrong topic categories.
• Consensus Auto-Reclassification: Automated consensus logic reclassifies post topics if multiple reports agree on the suggested topic.

4. Backfill Command

• **\pinkary:backfill-post-topics**: Artisan command to backfill existing posts into appropriate topics using hashtag matching and keyword inference with fallback to system topics.

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Verification

• Full test coverage across Models, Livewire components, Policies, and HTTP routes.
• Formatted with Laravel Pint.