refactor: make abstract methods on parent LLM class protected

Author: Serchinastico

src/lib/llm/services/llm-service.ts

@@ -17,8 +17,6 @@ export type LlmProvider = AnthropicProvider | OllamaProvider | OpenAICompatibleP
 export abstract class LlmService {
   constructor(protected config: Config) {}
 
-  abstract getAvailableModelIds(): Promise<string[]>
-
   async getModel(): Promise<LanguageModelV1> {
     const provider = await this.getProvider()
     const availableModelIds = await this.getAvailableModelIds()
@@ -29,5 +27,7 @@ export abstract class LlmService {
     return provider(modelId, {structuredOutputs: true})
   }
 
-  abstract getProvider(): Promise<LlmProvider>
+  protected abstract getAvailableModelIds(): Promise<string[]>
+
+  protected abstract getProvider(): Promise<LlmProvider>
 }

src/lib/llm/services/lmstudio.ts

@@ -36,6 +36,8 @@ export class LmStudio extends LlmService {
 
     const models = await this.getAvailableModelIds()
 
+    invariant(models.length > 0, 'llm:no_models_found')
+
     return new OpenAICompatibleChatLanguageModel(
       models[0],
       {},