Enhancement: Display total like count on individual photo details pages

[snilesh]

### Proposed Change
Add a public like counter next to or below the "Like" button on individual photo pages (e.g., ​https://wordpress.org/photos/photo/64668a7494/).

### Why this is helpful:

1. Community Feedback: Showing the total number of likes provides immediate recognition and encouragement to the photographers who contribute their work for free.
2. User Engagement: Visible social proof naturally encourages other users to interact with and download the photo.
3. Standard UX: Users expect to see engagement metrics alongside a "Like" button, similar to other photo-sharing platforms.

### Suggested UI:
A simple text counter next to the heart icon (e.g., "❤️ 15") or a small label below it (e.g., "15 likes"). If a photo has 0 likes, the counter can remain hidden to keep the UI clean.