realm: Add stun retry and lazy server start

Author: nekohasekai

go.mod

@@ -40,7 +40,7 @@ require (
 	github.com/sagernet/sing v0.8.11-0.20260514083559-7297f9541547
 	github.com/sagernet/sing-cloudflared v0.1.0
 	github.com/sagernet/sing-mux v0.3.4
-	github.com/sagernet/sing-quic v0.6.2-0.20260511084842-9deddf006024
+	github.com/sagernet/sing-quic v0.6.2-0.20260512113342-74f3e685d5a7
 	github.com/sagernet/sing-shadowsocks v0.2.8
 	github.com/sagernet/sing-shadowsocks2 v0.2.1
 	github.com/sagernet/sing-shadowtls v0.2.1-0.20250503051639-fcd445d33c11

go.sum

@@ -248,8 +248,8 @@ github.com/sagernet/sing-cloudflared v0.1.0 h1:to+2fcCx8zu4X/DirRw9Ihc+FrEZ7oEyI
 github.com/sagernet/sing-cloudflared v0.1.0/go.mod h1:bH2NKX+NpDTY1Zkxfboxw6MXB/ZywaNLmrDJYgKMJ2Y=
 github.com/sagernet/sing-mux v0.3.4 h1:ZQplKl8MNXutjzbMVtWvWG31fohhgOfCuUZR4dVQ8+s=
 github.com/sagernet/sing-mux v0.3.4/go.mod h1:QvlKMyNBNrQoyX4x+gq028uPbLM2XeRpWtDsWBJbFSk=
-github.com/sagernet/sing-quic v0.6.2-0.20260511084842-9deddf006024 h1:P1iab6udg2I2igIrn+mNKpPZNcuejSqno3jwJ/94upw=
-github.com/sagernet/sing-quic v0.6.2-0.20260511084842-9deddf006024/go.mod h1:+oqD54aHel4ALKkp1hVXWCgLU/EjLojvm6AUzDfvj0I=
+github.com/sagernet/sing-quic v0.6.2-0.20260512113342-74f3e685d5a7 h1:nDVG/86RW7LNVk8PZkASi16ntTiusV+n8gpscmnzwH4=
+github.com/sagernet/sing-quic v0.6.2-0.20260512113342-74f3e685d5a7/go.mod h1:+oqD54aHel4ALKkp1hVXWCgLU/EjLojvm6AUzDfvj0I=
 github.com/sagernet/sing-shadowsocks v0.2.8 h1:PURj5PRoAkqeHh2ZW205RWzN9E9RtKCVCzByXruQWfE=
 github.com/sagernet/sing-shadowsocks v0.2.8/go.mod h1:lo7TWEMDcN5/h5B8S0ew+r78ZODn6SwVaFhvB6H+PTI=
 github.com/sagernet/sing-shadowsocks2 v0.2.1 h1:dWV9OXCeFPuYGHb6IRqlSptVnSzOelnqqs2gQ2/Qioo=