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

In src/everything:

* Refactor / move streamableHttp.ts, sse.ts, and stdio.ts to transports/

* Move everything.ts to server/ for reference

* Add server/index.js
  - exports the createServer function
  - import registerTools from tools/index.js
  - in createServer()
    - read instructions.md and include in ServerOptions for McpServer constructor
    - construct McpServer instead of Server
    - call registerTools, passing server

* Add tools/echo.ts
  - define EchoSchema
  - define tool config
  - export addToolEcho function
  - in addToolEcho()
    - register handler for Echo tool

* Add tools/index.ts
  - import addToolEcho
  - export registerTools function
  - in registerTools()
    - call addToolEcho

src/everything/tools/echo.ts

@@ -0,0 +1,23 @@
+import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
+import { CallToolResult } from "@modelcontextprotocol/sdk/types.js";
+import { z } from "zod";
+
+export const EchoSchema = z.object({
+    message: z.string().describe("Message to echo"),
+});
+
+const name = "echo";
+const config = {
+    title: "Echo Tool",
+    description: "Echoes back the input string",
+    inputSchema: EchoSchema,
+};
+
+export const addToolEcho = (server: McpServer) => {
+    server.registerTool(name, config, async (args): Promise<CallToolResult> => {
+        const validatedArgs = EchoSchema.parse(args);
+        return {
+            content: [{ type: "text", text: `Echo: ${validatedArgs.message}` }],
+        };
+    });
+};

src/everything/tools/index.ts

@@ -0,0 +1,11 @@
+import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
+import { addToolEcho } from "./echo.js";
+
+
+/**
+ * Register the tools with the MCP server.
+ * @param server
+ */
+export const registerTools = (server: McpServer) => {
+  addToolEcho(server);
+};