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/models/subject.py

@@ -1,7 +1,7 @@
 import uuid
 from datetime import datetime, date
 
-from sqlalchemy import Date, DateTime, ForeignKey, String, Text, UniqueConstraint, func
+from sqlalchemy import Date, DateTime, ForeignKey, Integer, String, Text, UniqueConstraint, func
 from sqlalchemy.dialects.postgresql import UUID
 from sqlalchemy.orm import Mapped, mapped_column
 
@@ -22,6 +22,7 @@ class Subject(Base):
     enrollment_date: Mapped[date | None] = mapped_column(Date, nullable=True)
     baseline_date: Mapped[date | None] = mapped_column(Date, nullable=True)
     completion_date: Mapped[date | None] = mapped_column(Date, nullable=True)
+    actual_medication_count: Mapped[int | None] = mapped_column(Integer, nullable=True)
     drop_reason: Mapped[str | None] = mapped_column(Text, nullable=True)
     created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, server_default=func.now())
     updated_at: Mapped[datetime] = mapped_column(