Refactor to use SpeziLLM, SpeziChat, and Spezi 1.x #132

Job	Run time
SwiftLint / SwiftLint	14s
Build and Test Application / Test using xcodebuild or run fastlane	5m 57s
REUSE Compliance Check / REUSE Compliance Check	11s
Upload Coverage Report	0s
	6m 22s

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