feat: add like/love system for tools, collections, and agents
- Add ToolLike, CollectionLike, AgentLike junction tables with likeCount fields
- Create like/unlike API endpoints for all entity types
- Add user likes endpoints and public listings endpoints
- Create LikeButton component with optimistic UI updates
- Add collapsible Likes section in dashboard sidebar
- Create dashboard likes pages (overview, tools, collections, agents)
- Add public collections and agents pages with detail views
- Update AppHeader and MobileMenu with Collections/Agents navigation
- Auto-like on collection/agent creation
- Add heart icons to UI package
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
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