[WIP] Refactor everything server to be more modular and use recommended APIs.

* Updated architecture.md

* Refactor / renamed all addXPrompt, addXTool, and addXResource functions to registerX...

* Added the add tool

src/everything/tools/echo.ts

@@ -13,7 +13,7 @@ const config = {
   inputSchema: EchoSchema,
 };
 
-export const addToolEcho = (server: McpServer) => {
+export const registerEchoTool = (server: McpServer) => {
   server.registerTool(name, config, async (args): Promise<CallToolResult> => {
     const validatedArgs = EchoSchema.parse(args);
     return {