Add basic ping-pong websocket

Cargo.lock

@@ -214,6 +214,20 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "actix-ws"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a3a1fb4f9f2794b0aadaf2ba5f14a6f034c7e86957b458c506a8cb75953f2d99"
+dependencies = [
+ "actix-codec",
+ "actix-http",
+ "actix-web",
+ "bytestring",
+ "futures-core",
+ "tokio",
+]
+
 [[package]]
 name = "addr2line"
 version = "0.24.2"
@@ -2035,6 +2049,7 @@ dependencies = [
  "actix-remote-ip",
  "actix-session",
  "actix-web",
+ "actix-ws",
  "anyhow",
  "askama",
  "base16ct",
@@ -2057,6 +2072,8 @@ dependencies = [
  "serde_json",
  "sha2 0.11.0-pre.4",
  "thiserror 2.0.11",
+ "time",
+ "tokio",
  "urlencoding",
  "uuid",
 ]
@@ -3490,9 +3507,21 @@ dependencies = [
  "pin-project-lite",
  "signal-hook-registry",
  "socket2",
+ "tokio-macros",
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "tokio-macros"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e06d43f1345a3bcd39f6a56dbb7dcab2ba47e68e8ac134855e7e2bdbaf8cab8"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "tokio-native-tls"
 version = "0.3.1"