feat: add country dropdown and phone prefix

[cmnisal]

Summary

• enforce +94 prefix for phone input on registration form
• replace country text field with dropdown and auto-select user's country via IP
• add countries-list dependency

Testing

• npm test (fails: Missing script: "test")
• npm run lint

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https://chatgpt.com/codex/tasks/task_e_68a8c4f74e68832c89a3026f5907887b

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📥 Commits

Reviewing files that changed from the base of the PR and between bc87c97 and 5f728f9.

⛔ Files ignored due to path filters (1)

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📒 Files selected for processing (2)

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• src/app/subscription/page.tsx (6 hunks)

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• Commit unit tests in branch cmnisal/update-mobile-phone-validation-to-use-ip-based-dropdown

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