refactor(gemini-client): update naming and return type

Changed framework base name to "GeminiClient" and updated the return type of the gemini function to return a Gemini instance using Koin for dependency injection. This improves consistency and type safety in the API.

Author: hanrw

gemini-client/gemini-client-darwin/build.gradle.kts

@@ -13,7 +13,7 @@ kotlin {
     ).forEach { macosTarget ->
         macosTarget.binaries.framework {
             export(projects.geminiClient.geminiClientCore)
-            baseName = "geminiClientDarwin"
+            baseName = "GeminiClient"
             isStatic = true
         }
     }

gemini-client/gemini-client-darwin/src/appleMain/kotlin/com/tddworks/gemini/api/DarwinGemini.kt

@@ -23,5 +23,5 @@ object DarwinGemini {
     fun gemini(
         apiKey: () -> String = { "CONFIG_API_KEY" },
         baseUrl: () -> String = { Gemini.BASE_URL },
-    ) = initGemini(GeminiConfig(apiKey, baseUrl))
+    ): Gemini = initGemini(GeminiConfig(apiKey, baseUrl)).koin.get<Gemini>()
 }