Update Deno configuration and import statements to use full URLs

deno.json

@@ -1,13 +1,6 @@
 {
-  "compilerOptions": {
+  "imports": {
-    "allowJs": true,
+    "std/": "https://deno.land/std@0.220.1/"
-    "lib": ["deno.window"],
-    "strict": true
-  },
-  "importMap": {
-    "imports": {
-      "std/": "https://deno.land/std@0.220.1/"
-    }
   },
   "tasks": {
     "start": "deno run --allow-net --allow-env --allow-read main.ts",

import_map.json

@@ -0,0 +1,5 @@
+{
+  "imports": {
+    "std/": "https://deno.land/std@0.220.1/"
+  }
+} 

main.ts

@@ -1,7 +1,6 @@
-import { serve } from "std/http/server.ts";
+import { serve } from "https://deno.land/std@0.220.1/http/server.ts";
-import { crypto } from "std/crypto/mod.ts";
+import { crypto } from "https://deno.land/std@0.220.1/crypto/mod.ts";
-import { encode as base64Encode, decode as base64Decode } from "std/encoding/base64.ts";
+import { encode as base64Encode, decode as base64Decode } from "https://deno.land/std@0.220.1/encoding/base64.ts";
-import { createHmac } from "crypto";
 
 // 类型定义
 interface Vendor {