refactor(config): simplify service definitions with factory functions

Refactored the service configuration to reduce code duplication and separate data from logic.

- Created a shared `useWhatsappMsgSender` composable to handle WhatsApp URL generation and opening.
- Introduced `createService` and `createPlan` helper functions to programmatically add button actions.
- This eliminates the need to manually define `onClick` handlers for every pricing plan, making the service data purely declarative and easier to maintain.

app/composables/whatsappMsgSender.ts

@@ -0,0 +1,18 @@
+import { createSharedComposable } from "@vueuse/core";
+
+const _useWhatsappMsgSender = () => {
+  // --- WhatsApp 自动消息逻辑 ---
+  const sendMessage = (message: string) => {
+    const text = encodeURIComponent(message);
+    const url = `https://api.whatsapp.com/send?phone=+601157753558&text=${text}`;
+    window.open(url, "_blank");
+  };
+
+  return {
+    sendMessage,
+  };
+};
+
+export const useWhatsappMsgSender = createSharedComposable(
+  _useWhatsappMsgSender
+);