Frontend routes — Public contests, projects, profiles, and leaderboards

[Circuit-Overtime]

Parent: #6

Build public, indexable discovery surfaces for spectators and prospective contributors.

Routes

• / — platform landing page
• /contests — public contest directory
• /contests/[contestSlug] — contest overview
• /contests/[contestSlug]/projects — participating projects
• /contests/[contestSlug]/projects/[owner]/[repo] — public project detail
• /contests/[contestSlug]/leaderboard — contest ranking
• /u/[handle] — public contributor profile
• /privacy and /terms — legal surfaces

Acceptance criteria

• Public metadata, canonical URLs, and social previews are defined
• Lists support accessible loading, empty, and pagination states
• Private contest data never appears in public mocks or UI assumptions
• No backend implementation is included