feat(phase-9): implement MVP polishing and closure

T-032: User management admin panel - backend users router with CRUD, frontend UsersPage with modals

T-033: Audit log viewer - backend audit router with filters/pagination, frontend AuditLogPage

T-034: Global error handling - ErrorBoundary, LoadingSpinner, ErrorMessage, Toast components

T-035: Backend tests - pytest setup with SQLite, tests for health/auth/techniques/tests

T-036: Documentation - Updated README with testing section, created docs/API.md

backend/app/schemas/audit.py

@@ -0,0 +1,31 @@
+"""Pydantic schemas for Audit Log endpoints."""
+
+import uuid
+from datetime import datetime
+from typing import Any
+
+from pydantic import BaseModel, ConfigDict
+
+
+class AuditLogOut(BaseModel):
+    """Complete representation of an audit log entry."""
+
+    id: uuid.UUID
+    user_id: uuid.UUID | None = None
+    username: str | None = None  # Populated from user relationship
+    action: str
+    entity_type: str | None = None
+    entity_id: str | None = None
+    timestamp: datetime
+    details: dict[str, Any] | None = None
+
+    model_config = ConfigDict(from_attributes=True)
+
+
+class AuditLogPage(BaseModel):
+    """Paginated response for audit logs."""
+
+    items: list[AuditLogOut]
+    total: int
+    offset: int
+    limit: int