fix: HTML-escape IRC username in Owncast chat, fix WebSocket auth, fix echo suppression

- Escape angle brackets around IRC username so Owncast doesn't swallow
  them as HTML tags (&lt;nick&gt; instead of <nick>)
- Register a chat user via POST /api/chat/register to obtain an
  accessToken, then pass it as a query param when connecting to /ws
  (Owncast closes the WebSocket immediately without one)
- Cache the access token across reconnections; re-register only on
  rejection
- Add ws_display_name config option (default "IRC Bridge")
- Fix echo suppression: record_sent and is_echo now both compare
  raw body instead of mismatched formatted/raw values

Made-with: Cursor

src/config.rs

@@ -33,6 +33,8 @@ pub struct OwncastConfig {
     pub websocket_enabled: bool,
     #[serde(default = "default_health_poll_interval")]
     pub health_poll_interval_secs: u64,
+    #[serde(default = "default_ws_display_name")]
+    pub ws_display_name: String,
 }
 
 #[derive(Debug, Deserialize)]
@@ -70,6 +72,7 @@ fn default_webhook_port() -> u16 { 9078 }
 fn default_health_poll_interval() -> u64 { 30 }
 fn default_irc_prefix() -> String { "[IRC]".to_string() }
 fn default_owncast_prefix() -> String { "[OC]".to_string() }
+fn default_ws_display_name() -> String { "IRC Bridge".to_string() }
 fn default_socket_path() -> String { "/tmp/owncast-irc-bridge.sock".to_string() }
 
 impl Default for BridgeSettings {
@@ -104,6 +107,7 @@ impl BridgeConfig {
                 webhook_port: 9078,
                 websocket_enabled: false,
                 health_poll_interval_secs: 30,
+                ws_display_name: default_ws_display_name(),
             },
             bridge: BridgeSettings::default(),
             control: ControlConfig::default(),