temporal-spring-ai: README expansion and default-model-name consolidation #2525

Job	Run time
Code format	47s
Unit test with in-memory test service [Edge]	11m 34s
Javadoc	3m 18s
Unit test with cloud	4m 30s
Unit test with docker service [JDK8]	13m 52s
Build native test server / Build native test server (macos-15-intel, macOS, amd64)	12m 45s
Build native test server / Build native test server (ubuntu-24.04-arm, linux, arm64)	6m 9s
Build native test server / Build native test server (macos-latest, macOS, arm64)	4m 23s
Build native test server / Build native test server (ubuntu-latest, linux, amd64, false)	6m 59s
Build native test server / Build native test server (windows-latest, windows, amd64)	6m 23s
Build native test server / Build native test server (ubuntu-latest, linux, amd64, true)	6m 37s
	1h 17m 17s

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