feat(core): hot reload path configs when exact name match is found

When a new path configuration is added via the API with a name that exactly
matches an existing stream path, Mediamtx will now automatically hot reload
the path with the new configuration without requiring disconnection and
reconnection of publishers.

See bluenviron#3718

Author: jererobles

internal/core/path_manager.go

@@ -218,11 +218,16 @@ func (pm *pathManager) doReloadConf(newPaths map[string]*conf.Path) {
 			continue
 		}
 
-		// path now belongs to a different config: delete it
+		// Check if we should switch to a new configuration
+		// This happens when a new configuration is added with a name that exactly matches this path
+		if newConf, exists := newPaths[pathName]; exists && newConf.Name == pathName {
+			// Hot reload the path with the new configuration
+			go path.reloadConf(newConf)
+			continue
+		}
+
+		// path now belongs to a different config but we can't switch to it (less specific): keep current config
 		if pathConf.Name != path.conf.Name {
-			pm.removePath(path)
-			path.close()
-			path.wait() // avoid conflicts between sources
 			continue
 		}