feat: refine subject visits and project workflows

Add early termination visit workflow with ordering, non-applicable visit handling, visit window display, and medication adherence support.

Extend monitoring visit issue template fields, site scoping, setup draft project info handling, login security UI, attachment behavior, and related tests/migrations.

backend/app/crud/site.py

@@ -21,6 +21,7 @@ from app.models.finance_special import FinanceSpecial
 from app.models.kickoff_meeting import KickoffMeeting
 from app.models.knowledge_note import KnowledgeNote
 from app.models.milestone import Milestone
+from app.models.monitoring_visit_issue import MonitoringVisitIssue
 from app.models.site import Site
 from app.models.special_expense import SpecialExpense
 from app.models.startup_ethics import StartupEthics
@@ -328,6 +329,11 @@ async def delete_site_and_related(db: AsyncSession, site: Site) -> None:
     await db.execute(delete(ContractFee).where(ContractFee.center_id == site_id))
     await db.execute(delete(SpecialExpense).where(SpecialExpense.center_id == site_id))
     await db.execute(delete(DrugShipment).where(DrugShipment.center_id == site_id))
+    await db.execute(
+        update(MonitoringVisitIssue)
+        .where(MonitoringVisitIssue.site_id == site_id)
+        .values(site_id=None)
+    )
 
     await db.execute(
         delete(TrainingAuthorization).where(