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Deleted outdated SDKs and services, including DocumentService and markdown-sdk.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.

src/components/chat/input-menu/InputMenu.tsx

@@ -19,7 +19,7 @@ import ClientChatStore from "../../../stores/ClientChatStore";
 import clientChatStore from "../../../stores/ClientChatStore";
 import FlyoutSubMenu from "./FlyoutSubMenu";
 import { useIsMobile } from "../../contexts/MobileContext";
-import { useIsMobile as useIsMobileUserAgent } from "../../../layout/_IsMobileHook";
+import { useIsMobile as useIsMobileUserAgent } from "../../../hooks/_IsMobileHook";
 import { getModelFamily, SUPPORTED_MODELS } from "../lib/SupportedModels";
 import { formatConversationMarkdown } from "../lib/exportConversationAsMarkdown";
 

src/components/chat/input/ChatInput.tsx

@@ -11,7 +11,7 @@ import chatStore from "../../../stores/ClientChatStore";
 import InputMenu from "../input-menu/InputMenu";
 import InputTextarea from "./ChatInputTextArea";
 import SendButton from "./ChatInputSendButton";
-import { useMaxWidth } from "../../../layout/useMaxWidth";
+import { useMaxWidth } from "../../../hooks/useMaxWidth";
 import userOptionsStore from "../../../stores/UserOptionsStore";
 
 const ChatInput = observer(() => {

src/layout/Content.tsx

@@ -1,6 +1,7 @@
 import { Flex } from "@chakra-ui/react";
 import React from "react";
 import { useIsMobile } from "../components/contexts/MobileContext";
+
 function Content({ children }) {
   const isMobile = useIsMobile();
   return (