feat: add equipment area grouping, criticality, and batch inspection

- Add area and criticality fields to Machine model with DB migration
- Add batch inspection endpoint (POST /inspections/batch) for area-wide inspection creation
- Rewrite MachineList with area grouping, criticality badges, and batch inspect button
- Update machine create/edit forms with area and criticality fields
- Update seed data with area/criticality values for all tenants

src/database/models.py

@@ -65,6 +65,8 @@ class Machine(Base):
     manufacturer = Column(String(100), nullable=True)
     installation_date = Column(TIMESTAMP(timezone=True), nullable=True)
     location = Column(String(200), nullable=True)
+    area = Column(String(50), nullable=True)  # 구역 그룹핑: Bay 3, A라인 등
+    criticality = Column(String(20), default="major")  # critical | major | minor
     rated_capacity = Column(String(100), nullable=True)
     power_rating = Column(String(100), nullable=True)
     description = Column(Text, nullable=True)
@@ -76,7 +78,11 @@ class Machine(Base):
         "EquipmentPart", back_populates="machine", cascade="all, delete-orphan"
     )
 
-    __table_args__ = (Index("ix_machines_tenant_id", "tenant_id"),)
+    __table_args__ = (
+        Index("ix_machines_tenant_id", "tenant_id"),
+        Index("ix_machines_tenant_area", "tenant_id", "area"),
+        Index("ix_machines_tenant_criticality", "tenant_id", "criticality"),
+    )
 
 
 class EquipmentPart(Base):