feat: SNOMED background coding pipeline + ABDM Coding Panel
- Add opd_coding_queue + opd_snomed_suggestions migrations
- Add ProcessSnomedCoding spark command (cron: snomed:process-coding)
Extracts clinical phrases, matches local SNOMED FULLTEXT, saves suggestions
- Add AbdmCodingPanel controller: index/review/confirm/reject/correct/mark_fhir_ready/tip_check
- Add coding_panel + coding_panel_review views (Bootstrap 5, AJAX actions)
- Inject queue trigger in opd_prescription_save (fail-open, ON DUPLICATE KEY)
- Add consult form tip badge: polls tip_check 4s after save, shows review link
- Add AbdmCodingPanel routes behind abdm permission filter
- Various ABDM gateway, FHIR, ABHA, SNOMED library updates