Remove unused services and refactor SDK structure

Deleted outdated SDKs and services, including DocumentService and markdown-sdk. Consolidated and relocated SDKs into a unified "providers" structure to improve maintainability. Updated imports and adjusted utils naming for consistency.

workers/site/providers/fireworks.ts

@@ -0,0 +1,92 @@
+import { OpenAI } from "openai";
+import {
+  _NotCustomized,
+  castToSnapshot,
+  getSnapshot,
+  ISimpleType,
+  ModelPropertiesDeclarationToProperties,
+  ModelSnapshotType2,
+  UnionStringArray,
+} from "mobx-state-tree";
+import Message from "../models/Message";
+import ChatSdk from "../sdk/chat-sdk";
+
+export class FireworksAiChatSdk {
+  private static async streamFireworksResponse(
+    messages: any[],
+    opts: {
+      model: string;
+      maxTokens: number | unknown | undefined;
+      openai: OpenAI;
+    },
+    dataCallback: (data: any) => void,
+  ) {
+    let modelPrefix = "accounts/fireworks/models/";
+    if (opts.model.toLowerCase().includes("yi-")) {
+      modelPrefix = "accounts/yi-01-ai/models/";
+    }
+
+    const fireworksStream = await opts.openai.chat.completions.create({
+      model: `${modelPrefix}${opts.model}`,
+      messages: messages,
+      stream: true,
+    });
+
+    for await (const chunk of fireworksStream) {
+      dataCallback({ type: "chat", data: chunk });
+    }
+  }
+
+  static async handleFireworksStream(
+    param: {
+      openai: OpenAI;
+      systemPrompt: any;
+      preprocessedContext: ModelSnapshotType2<
+        ModelPropertiesDeclarationToProperties<{
+          role: ISimpleType<UnionStringArray<string[]>>;
+          content: ISimpleType<unknown>;
+        }>,
+        _NotCustomized
+      >;
+      maxTokens: number;
+      messages: any;
+      model: any;
+      env: Env;
+    },
+    dataCallback: (data) => void,
+  ) {
+    const {
+      preprocessedContext,
+      messages,
+      env,
+      maxTokens,
+      systemPrompt,
+      model,
+    } = param;
+
+    const assistantPrompt = ChatSdk.buildAssistantPrompt({
+      maxTokens: maxTokens,
+    });
+
+    const safeMessages = ChatSdk.buildMessageChain(messages, {
+      systemPrompt: systemPrompt,
+      model,
+      assistantPrompt,
+      toolResults: preprocessedContext,
+    });
+
+    const fireworksOpenAIClient = new OpenAI({
+      apiKey: param.env.FIREWORKS_API_KEY,
+      baseURL: "https://api.fireworks.ai/inference/v1",
+    });
+    return FireworksAiChatSdk.streamFireworksResponse(
+      safeMessages,
+      {
+        model: param.model,
+        maxTokens: param.maxTokens,
+        openai: fireworksOpenAIClient,
+      },
+      dataCallback,
+    );
+  }
+}