feat: complete 5 GAP requirements — auto counters, inspection alarms, machine specs, responsive CSS

- GAP 2+4: auto_time/date counter auto-computation with manual update blocking
- GAP 3: auto-generate alarms on inspection completion for failed items
- GAP 1: machine spec fields (manufacturer, location, capacity, power, description)
- GAP 5: enhanced mobile responsive CSS (768px/480px breakpoints)
- Alembic migration for new columns, seed data enriched with specs and date-type parts

src/database/models.py

@@ -62,6 +62,12 @@ class Machine(Base):
     name = Column(String(100), nullable=False)
     equipment_code = Column(String(50), default="")
     model = Column(String(100), nullable=True)
+    manufacturer = Column(String(100), nullable=True)
+    installation_date = Column(TIMESTAMP(timezone=True), nullable=True)
+    location = Column(String(200), nullable=True)
+    rated_capacity = Column(String(100), nullable=True)
+    power_rating = Column(String(100), nullable=True)
+    description = Column(Text, nullable=True)
     created_at = Column(TIMESTAMP(timezone=True), default=utcnow)
     updated_at = Column(TIMESTAMP(timezone=True), default=utcnow, onupdate=utcnow)
 
@@ -313,13 +319,18 @@ class Alarm(Base):
     id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
     tenant_id = Column(String(50), ForeignKey("tenants.id"), nullable=False)
     equipment_part_id = Column(
-        UUID(as_uuid=True), ForeignKey("equipment_parts.id"), nullable=False
+        UUID(as_uuid=True), ForeignKey("equipment_parts.id"), nullable=True
     )
-    machine_id = Column(UUID(as_uuid=True), ForeignKey("machines.id"), nullable=False)
-    alarm_type = Column(String(30), nullable=False)  # threshold | critical
-    severity = Column(String(20), nullable=False)  # warning | critical
+    machine_id = Column(UUID(as_uuid=True), ForeignKey("machines.id"), nullable=True)
+    inspection_session_id = Column(
+        UUID(as_uuid=True),
+        ForeignKey("inspection_sessions.id"),
+        nullable=True,
+    )
+    alarm_type = Column(String(30), nullable=False)
+    severity = Column(String(20), nullable=False)
     message = Column(String(500), nullable=False)
-    lifecycle_pct_at_trigger = Column(Float, nullable=False)
+    lifecycle_pct_at_trigger = Column(Float, nullable=True)
     is_acknowledged = Column(Boolean, default=False)
     acknowledged_by = Column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=True)
     acknowledged_at = Column(TIMESTAMP(timezone=True), nullable=True)
@@ -328,6 +339,7 @@ class Alarm(Base):
     tenant = relationship("Tenant")
     equipment_part = relationship("EquipmentPart")
     machine = relationship("Machine")
+    inspection_session = relationship("InspectionSession")
     acknowledged_user = relationship("User")
 
     __table_args__ = (