feat: add Hospital / Healthcare Management database template

[kritgarg]

This PR adds a new database template called Hospital / Healthcare Management.

The template includes 9 tables:
patients, doctors, departments, appointments, medical_records, rooms, admissions, billing, and users.

The schema is designed to support common hospital operations such as patient registration, doctor specialization, scheduling appointments, maintaining medical records, room assignments, hospital admissions, and billing.

The structure follows the same style and relationship patterns as the existing templates:

• consistent column naming
• correct primary and foreign keys
• realistic ENUM values
• singular table names
• no breaking changes to existing templates

I have tested the template to ensure there are no missing relationships or errors.
Please let me know if any improvements or changes are needed — I would be happy to update the PR.

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