feat: Refactor server implementation to support Bun and Node environments

- Introduced `ServerNode` and `BunServer` classes to handle server logic for Node and Bun respectively.
- Updated `App` class to initialize the appropriate server based on the runtime environment.
- Enhanced `parseBody` function to handle request body parsing for both environments.
- Modified WebSocket handling to support Bun's WebSocket upgrade mechanism.
- Improved error handling and response structure across the server implementation.
- Added support for custom middleware in the server's request handling.
- Refactored server base functionality into `ServerBase` for better code organization.
- Updated type definitions to reflect changes in server options and listener handling.
- Added a new demo for testing the server functionality with various request types.

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "@kevisual/router",
-  "version": "0.0.39",
+  "version": "0.0.41",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@kevisual/router",
-      "version": "0.0.39",
+      "version": "0.0.41",
       "license": "MIT",
       "dependencies": {
         "path-to-regexp": "^8.3.0",
@@ -20,6 +20,7 @@
         "@rollup/plugin-commonjs": "29.0.0",
         "@rollup/plugin-node-resolve": "^16.0.3",
         "@rollup/plugin-typescript": "^12.3.0",
+        "@types/bun": "^1.3.5",
         "@types/node": "^25.0.3",
         "@types/send": "^1.2.1",
         "@types/ws": "^8.18.1",
@@ -729,6 +730,16 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@types/bun": {
+      "version": "1.3.5",
+      "resolved": "https://registry.npmjs.org/@types/bun/-/bun-1.3.5.tgz",
+      "integrity": "sha512-RnygCqNrd3srIPEWBd5LFeUYG7plCoH2Yw9WaZGyNmdTEei+gWaHqydbaIRkIkcbXwhBT94q78QljxN0Sk838w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "bun-types": "1.3.5"
+      }
+    },
     "node_modules/@types/eslint": {
       "version": "9.6.1",
       "dev": true,
@@ -1132,6 +1143,16 @@
       "license": "MIT",
       "peer": true
     },
+    "node_modules/bun-types": {
+      "version": "1.3.5",
+      "resolved": "https://registry.npmjs.org/bun-types/-/bun-types-1.3.5.tgz",
+      "integrity": "sha512-inmAYe2PFLs0SUbFOWSVD24sg1jFlMPxOjOSSCYqUgn4Hsc3rDc7dFvfVYjFPNHtov6kgUeulV4SxbuIV/stPw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/bytestreamjs": {
       "version": "2.0.1",
       "license": "BSD-3-Clause",