**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/groq.ts

@@ -0,0 +1,82 @@
+import {
+  _NotCustomized,
+  ISimpleType,
+  ModelPropertiesDeclarationToProperties,
+  ModelSnapshotType2,
+  UnionStringArray,
+} from 'mobx-state-tree';
+import { OpenAI } from 'openai';
+
+import { ProviderRepository } from './_ProviderRepository.ts';
+import { BaseChatProvider, CommonProviderParams } from './chat-stream-provider.ts';
+
+export class GroqChatProvider extends BaseChatProvider {
+  getOpenAIClient(param: CommonProviderParams): OpenAI {
+    return new OpenAI({
+      baseURL: ProviderRepository.OPENAI_COMPAT_ENDPOINTS.groq,
+      apiKey: param.env.GROQ_API_KEY,
+    });
+  }
+
+  getStreamParams(param: CommonProviderParams, safeMessages: any[]): any {
+    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 GroqChatSdk {
+  private static provider = new GroqChatProvider();
+
+  static async handleGroqStream(
+    param: {
+      openai: OpenAI;
+      systemPrompt: any;
+      preprocessedContext: ModelSnapshotType2<
+        ModelPropertiesDeclarationToProperties<{
+          role: ISimpleType<UnionStringArray<string[]>>;
+          content: ISimpleType<unknown>;
+        }>,
+        _NotCustomized
+      >;
+      maxTokens: unknown | number | undefined;
+      messages: any;
+      model: string;
+      env: Env;
+    },
+    dataCallback: (data) => void,
+  ) {
+    return this.provider.handleStream(
+      {
+        systemPrompt: param.systemPrompt,
+        preprocessedContext: param.preprocessedContext,
+        maxTokens: param.maxTokens,
+        messages: param.messages,
+        model: param.model,
+        env: param.env,
+      },
+      dataCallback,
+    );
+  }
+}