Support domain in config file

cove-config/src/lib.rs

@@ -107,7 +107,12 @@ impl Config {
         })
     }
 
-    pub fn euph_room(&self, name: &str) -> EuphRoom {
-        self.euph.rooms.get(name).cloned().unwrap_or_default()
+    pub fn euph_room(&self, domain: &str, name: &str) -> EuphRoom {
+        if let Some(server) = self.euph.servers.get(domain) {
+            if let Some(room) = server.rooms.get(name) {
+                return room.clone();
+            }
+        }
+        EuphRoom::default()
     }
 }