feat: private spaces

[fforbeck]

feat: Implement Private Spaces Feature

Overview

Implements private spaces functionality with client-side encryption and access control based on email domains and subscription plans.

Key Features

• Private Spaces: Client-side encrypted file storage with tabbed interface separating public/private spaces
• Access Control: Restricted to @dmail.ai and @storacha.network email domains with paid plans (controlled via feature flags)
• Hide but Preserve: Private spaces hidden on downgrade but data preserved
• User Experience: Upgrade prompts for eligible users, visual type indicators, enhanced space creation flow

Technical Implementation

• Private spaces access validation hooks
• Feature flags system for controlled rollout
• Filtered spaces functionality with visibility logic
• TypeScript types and UCAN integration
• Fallback handling for plan API issues

Access Requirements

• Email: @dmail.ai or @storacha.network domains
• Plan: Paid subscription (excludes starter/free tiers)
• Backward compatible with existing public spaces

Screenshots

TODO

• Encryption/Decryption

Blocked by:

• feat: private spaces upload-service#305
• feat: encryption & decryption with KMS upload-service#294
• feat: private gateway freeway#180

Closes storacha/project-tracking#524
Closes storacha/project-tracking#525

[github-actions]

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