Use rustls and regex-lite; refactor HTTP API

Switch reqwest to rustls-no-provider and add rustls crate; install
rustls provider at startup. Replace regex::Regex with regex_lite::Regex
across code. Consolidate api_get/post/put/delete into a single
api_request that takes a Method and optional body. Add .dockerignore and
UPX compression in Dockerfile. Remove unused domain/IDNA code, trim dead
helpers, tweak tokio flavor and release opt-level, and update tests to
use crate::test_client()

.dockerignore

@@ -0,0 +1,6 @@
+target/
+.git/
+.github/
+.gitignore
+*.md
+LICENSE