TUN-3201: Create base cloudflared UI structure

vendor/github.com/gdamore/tcell/terminfo/models.txt

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+adm3a
+aixterm
+ansi
+aterm
+beterm
+bsdos-pc
+cygwin
+d200
+d210
+dtterm
+eterm,eterm-color|emacs
+Eterm,Eterm-88color,Eterm-256color|eterm
+gnome,gnome-256color
+hpterm
+hz1500
+konsole,konsole-256color
+kterm
+linux
+pcansi
+rxvt,rxvt-256color,rxvt-88color,rxvt-unicode,rxvt-unicode-256color
+screen,screen-256color
+st,st-256color|simpleterm
+sun,sun-color
+termite
+tvi910
+tvi912
+tvi921
+tvi925
+tvi950
+tvi970
+vt52
+vt100
+vt102
+vt220
+vt320
+vt400
+vt420
+wy50
+wy60
+wy99-ansi,wy99a-ansi
+xfce
+xnuppc
+xterm,xterm-88color,xterm-256color