Implement AuditLog entity and EF Core configuration for Sprint 2 Story 1 Task 1.
Changes:
- Created AuditLog entity with multi-tenant support
- Added EF Core configuration with JSONB columns for PostgreSQL
- Created composite indexes for query optimization
- Generated database migration (20251104220842_AddAuditLogTable)
- Updated PMDbContext with AuditLog DbSet and query filter
- Updated task status to in_progress in sprint plan
Technical Details:
- PostgreSQL JSONB type for OldValues/NewValues (flexible schema)
- Composite index on (TenantId, EntityType, EntityId) for entity history queries
- Timestamp index (DESC) for recent logs queries
- UserId index for user activity tracking
- Multi-tenant query filter applied to AuditLog
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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