feat: 重构代码结构，更新插件导出，添加构建配置和npm配置文件

bun.config.ts

@@ -0,0 +1,19 @@
+import { resolvePath } from '@kevisual/use-config';
+import { execSync } from 'node:child_process';
+
+const entry = 'agent/opencode.ts';
+const naming = 'opencode';
+const external: string[] = ["bun"];
+await Bun.build({
+  target: 'node',
+  format: 'esm',
+  entrypoints: [resolvePath(entry, { meta: import.meta })],
+  outdir: resolvePath('./dist', { meta: import.meta }),
+  naming: {
+    entry: `${naming}.js`,
+  },
+  external,
+});
+
+const cmd = 'dts -i agent/opencode.ts -o opencode.d.ts';
+execSync(cmd);