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.
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