Add real-time deployment updates and refactor JavaScript

- Add deploy stats (last deploy time, total count) to dashboard
- Add recent-deployments API endpoint for real-time updates
- Add live build logs to deployments history page
- Fix git clone regression (preserve entrypoint for simple clones)
- Refactor JavaScript into shared app.js with page init functions
- Deploy button disables immediately on click
- Auto-refresh deployment list and logs during builds
- Format JavaScript with Prettier (4-space indent)

internal/server/routes.go

@@ -69,6 +69,7 @@ func (s *Server) SetupRoutes() {
 		r.Get("/apps/{id}/logs", s.handlers.HandleAppLogs())
 		r.Get("/apps/{id}/container-logs", s.handlers.HandleContainerLogsAPI())
 		r.Get("/apps/{id}/status", s.handlers.HandleAppStatusAPI())
+		r.Get("/apps/{id}/recent-deployments", s.handlers.HandleRecentDeploymentsAPI())
 		r.Post("/apps/{id}/restart", s.handlers.HandleAppRestart())
 		r.Post("/apps/{id}/stop", s.handlers.HandleAppStop())
 		r.Post("/apps/{id}/start", s.handlers.HandleAppStart())