fix(cast): localize UPnP URL compatibility and harden crash diagnostics

Keep http 1.5 and tolerate empty or relative service URLs in a local rupnp patch. Cover standard DLNA SOAP requests and malformed descriptions.

Avoid logger locks in fatal handlers, flush emitted log batches, and preserve CI symbols after smoke failures.

cx

third-party/rupnp/.gitignore

@@ -0,0 +1,5 @@
+/target
+/.idea
+/descriptions
+**/*.rs.bk
+Cargo.lock