- Replace all patient_master_exten checks with patient_master across Medical.php
- Fixes blank patient info in multiple pharmacy pages:
* /Medical/ipd_print/{id}/credit - IPD print bills (UHID, Patient name)
* Counter sale forms and invoice editing
* Patient search functionality
* IPD group print consolidated views
* Auto UHID lookup endpoints
- patient_master_exten table exists but lacks core patient fields (p_fname, p_rname, p_code)
- Ensures consistent patient data display throughout pharmacy module
- Matches earlier fixes for billing and invoice list pages
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