**Refactor:** Restructure server package to streamline imports and improve file organization

- Moved `providers`, `services`, `models`, `lib`, and related files to `src` directory within `server` package.
- Adjusted imports across the codebase to reflect the new paths.
- Renamed several `.ts` files for consistency.
- Introduced an `index.ts` in the `ai/providers` package to export all providers.

This improves maintainability and aligns with the project's updated directory structure.

packages/ai/providers/cerebras.ts

@@ -0,0 +1,73 @@
+import { OpenAI } from 'openai';
+
+import { ProviderRepository } from './_ProviderRepository.ts';
+import { BaseChatProvider, type CommonProviderParams } from './chat-stream-provider.ts';
+
+export class CerebrasChatProvider extends BaseChatProvider {
+  getOpenAIClient(param: CommonProviderParams): OpenAI {
+    return new OpenAI({
+      baseURL: ProviderRepository.OPENAI_COMPAT_ENDPOINTS.cerebras,
+      apiKey: param.env.CEREBRAS_API_KEY,
+    });
+  }
+
+  getStreamParams(param: CommonProviderParams, safeMessages: any[]): any {
+    // models provided by cerebras do not follow standard tune params
+    // they must be individually configured
+    // const tuningParams = {
+    //   temperature: 0.86,
+    //   top_p: 0.98,
+    //   presence_penalty: 0.1,
+    //   frequency_penalty: 0.3,
+    //   max_tokens: param.maxTokens as number,
+    // };
+
+    return {
+      model: param.model,
+      messages: safeMessages,
+      stream: true,
+      // ...tuningParams
+    };
+  }
+
+  async processChunk(chunk: any, dataCallback: (data: any) => void): Promise<boolean> {
+    if (chunk.choices && chunk.choices[0]?.finish_reason === 'stop') {
+      dataCallback({ type: 'chat', data: chunk });
+      return true;
+    }
+
+    dataCallback({ type: 'chat', data: chunk });
+    return false;
+  }
+}
+
+export class CerebrasSdk {
+  private static provider = new CerebrasChatProvider();
+
+  static async handleCerebrasStream(
+    param: {
+      openai: OpenAI;
+      systemPrompt: any;
+      disableWebhookGeneration: boolean;
+      preprocessedContext: any;
+      maxTokens: unknown | number | undefined;
+      messages: any;
+      model: string;
+      env: Env;
+    },
+    dataCallback: (data: any) => void,
+  ) {
+    return this.provider.handleStream(
+      {
+        systemPrompt: param.systemPrompt,
+        preprocessedContext: param.preprocessedContext,
+        maxTokens: param.maxTokens,
+        messages: param.messages,
+        model: param.model,
+        env: param.env,
+        disableWebhookGeneration: param.disableWebhookGeneration,
+      },
+      dataCallback,
+    );
+  }
+}