[Glense][Search] Implement search across videos and channels with view tracking

[Brankonymous]

Summary

• Add search endpoint (GET /api/videos/search) with case-insensitive title/description matching and optional category
  filter
• Add search results page with parallel video + channel search, category filter chips, and responsive layout
• Add view count tracking (PATCH /api/videos/{id}/view) with atomic DB increment and IP-based deduplication (30min
  TTL)
• Add user like status endpoint (GET /api/videolikes/{videoId})
• Fix search bar: empty search prevention, URL encoding, submit button type
• Fix channel links to use uploaderId instead of username in VideoCard and VideoStream