Add Reddit Social Media Integration

[thunder-velvet]

Description

Implement Reddit as a social media scheduling provider, allowing users to schedule and publish posts directly to Reddit subreddits.

Requirements

• Create a Reddit provider class implementing the ProviderInterface in packages/backend/scheduler/providers/reddit.provider.ts
• The implementation should support:
  • Authentication with Reddit API (OAuth2)
  • Posting text content to subreddits
  • Uploading and attaching media (images) to posts
  • Supporting different post types (text, link, image)
  • Selecting target subreddits for posting

Implementation Details

• Create a new Reddit class that implements the ProviderInterface
• Add OAuth2 authentication flow for Reddit
• Implement token refresh mechanism (Reddit tokens expire)
• Add to SchedulerList in packages/backend/scheduler/scheduler.list.ts
• Add appropriate UI elements for Reddit connection
• Update the social media selection UI to include Reddit option
• Implement subreddit selection mechanism in the UI
• Handle different post types (text vs. link vs. media posts)

API Documentation

Reddit API Documentation

Technical Considerations

• Reddit's API rate limits need to be respected
• Different post types require different API endpoints
• Will need to handle subreddit selection as part of the posting process
• Reddit requires a registered application for OAuth2
• May need to implement special handling for link posts vs. text posts

Testing

• Test authentication flow
• Test posting with and without media attachments
• Test token refresh mechanism
• Test different post types (text, link, image)
• Test subreddit selection functionality

Design

• Add Reddit logo to the social media selection UI
• Use the standard Reddit branding colors
• Consider UI for selecting target subreddits