feat: Phase 4 — inspection sessions (create, execute, complete)

Backend:
- InspectionSession + InspectionRecord models with alembic migration
- 6 API endpoints: create, list, get detail, save records, complete, delete
- Auto pass/fail judgment for numeric (spec range) and boolean items
- Completed inspections are immutable, required items enforced on complete
- 14 new tests (total 53/53 passed)

Frontend:
- Inspection list page with in_progress/completed tabs
- Template select modal for starting new inspections
- Inspection execution page with data-type-specific inputs
- Auto-save with 1.5s debounce, manual save button
- Completion modal with notes and required item validation
- Read-only view for completed inspections
- Pass/fail badges and color-coded item cards

Co-Authored-By: Claude Opus 4 <noreply@anthropic.com>

src/database/models.py

@@ -233,3 +233,75 @@ class InspectionTemplateItem(Base):
     __table_args__ = (
         Index("ix_template_items_template_order", "template_id", "sort_order"),
     )
+
+
+class InspectionSession(Base):
+    __tablename__ = "inspection_sessions"
+
+    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    tenant_id = Column(String(50), ForeignKey("tenants.id"), nullable=False)
+    template_id = Column(
+        UUID(as_uuid=True),
+        ForeignKey("inspection_templates.id"),
+        nullable=False,
+    )
+    inspector_id = Column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=False)
+    status = Column(
+        String(20), nullable=False, default="draft"
+    )  # draft | in_progress | completed
+    started_at = Column(TIMESTAMP(timezone=True), nullable=True)
+    completed_at = Column(TIMESTAMP(timezone=True), nullable=True)
+    notes = Column(Text, nullable=True)
+    created_at = Column(TIMESTAMP(timezone=True), default=utcnow)
+    updated_at = Column(TIMESTAMP(timezone=True), default=utcnow, onupdate=utcnow)
+
+    tenant = relationship("Tenant")
+    template = relationship("InspectionTemplate")
+    inspector = relationship("User")
+    records = relationship(
+        "InspectionRecord",
+        back_populates="session",
+        cascade="all, delete-orphan",
+    )
+
+    __table_args__ = (
+        Index("ix_sessions_tenant_status", "tenant_id", "status"),
+        Index("ix_sessions_tenant_template", "tenant_id", "template_id"),
+        Index("ix_sessions_tenant_inspector", "tenant_id", "inspector_id"),
+    )
+
+
+class InspectionRecord(Base):
+    __tablename__ = "inspection_records"
+
+    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    session_id = Column(
+        UUID(as_uuid=True),
+        ForeignKey("inspection_sessions.id", ondelete="CASCADE"),
+        nullable=False,
+    )
+    template_item_id = Column(
+        UUID(as_uuid=True),
+        ForeignKey("inspection_template_items.id"),
+        nullable=False,
+    )
+    value_numeric = Column(Float, nullable=True)
+    value_boolean = Column(Boolean, nullable=True)
+    value_text = Column(Text, nullable=True)
+    value_select = Column(String(200), nullable=True)
+    is_pass = Column(
+        Boolean, nullable=True
+    )  # None = 미판정, True = 합격, False = 불합격
+    recorded_at = Column(TIMESTAMP(timezone=True), nullable=True)
+    created_at = Column(TIMESTAMP(timezone=True), default=utcnow)
+    updated_at = Column(TIMESTAMP(timezone=True), default=utcnow, onupdate=utcnow)
+
+    session = relationship("InspectionSession", back_populates="records")
+    template_item = relationship("InspectionTemplateItem")
+
+    __table_args__ = (
+        UniqueConstraint(
+            "session_id", "template_item_id", name="uq_record_session_item"
+        ),
+        Index("ix_records_session", "session_id"),
+    )