Refactor to use SpeziLLM, SpeziChat, and Spezi 1.x #130

Job	Run time
REUSE Compliance Check / REUSE Compliance Check	8s
Build and Test Application / Test using xcodebuild or run fastlane	6m 41s
SwiftLint / SwiftLint	18s
Upload Coverage Report / Create and upload coverage report	4m 13s
	11m 20s

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