docs: add class diagram wiki page

Class-Diagram.md

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+# Class Diagram
+
+Full class and interface hierarchy for `HrynCo.DAL.Abstract` and `HrynCo.DAL.EF`.
+
+```mermaid
+classDiagram
+    namespace HrynCo_DAL_Abstract {
+        class IEntity {
+            <<interface>>
+            +object Id
+            +DateTimeOffset Created
+            +DateTimeOffset? Updated
+        }
+        class IEntityTId {
+            <<interface>>
+            +TId Id
+        }
+        class EntityTId {
+            <<abstract>>
+            +TId Id
+            +DateTimeOffset Created
+            +DateTimeOffset? Updated
+        }
+        class Entity {
+            <<abstract>>
+            +Guid Id
+        }
+        class NamedEntity {
+            <<abstract>>
+            +string Name
+        }
+        class IUnitOfWork {
+            <<interface>>
+            +BeginTransactionAsync() Task~ITransaction~
+            +GetCurrentTransaction() ITransaction?
+            +ExecuteInTransactionAsync(action) Task
+            +ExecuteInTransactionAsync~TResult~(action) Task~TResult~
+        }
+        class ITransaction {
+            <<interface>>
+            +CommitAsync() Task
+            +RollbackAsync() Task
+            +DisposeAsync() ValueTask
+        }
+        class PagedResultT {
+            <<sealed>>
+            +IReadOnlyList~T~ Items
+            +int Page
+            +int PageSize
+            +int TotalCount
+        }
+    }
+
+    namespace HrynCo_DAL_EF {
+        class IEfRepository {
+            <<interface>>
+            +ClearChangeTracker()
+        }
+        class IEfRepositoryTEntityTId {
+            <<interface>>
+            +Add(entity) TEntity
+            +AddAsync(entity) Task~TEntity~
+            +Delete(id)
+            +DeleteAsync(id) Task
+            +Get(filter, orderBy, includes) IQueryable~TEntity~
+            +GetAll() IQueryable~TEntity~
+            +GetAllAsync() Task~List~TEntity~~
+            +GetById(id) TEntity?
+            +GetByIdAsync(id) Task~TEntity?~
+            +Exists(id) Task~bool~
+            +UpdateAsync(entity) Task
+            +SaveChangesAsync() Task
+        }
+        class IEfRepositoryTEntity {
+            <<interface>>
+        }
+        class BaseEfRepositoryTDbContextTEntityTEntityId {
+            <<abstract>>
+            +TDbContext DbContext
+            +Add() TEntity
+            +AddAsync() Task~TEntity~
+            +Delete()
+            +DeleteAsync() Task
+            +Get() IQueryable~TEntity~
+            +GetAll() IQueryable~TEntity~
+            +GetAllAsync() Task~List~TEntity~~
+            +GetById() TEntity?
+            +GetByIdAsync() Task~TEntity?~
+            +Exists() Task~bool~
+            +Update()
+            +UpdateAsync() Task
+            +SaveChangesAsync() Task
+            #DoRemove()
+        }
+        class BaseRepositoryTEfRepositoryTDbContextTEntityTEntityId {
+            <<abstract>>
+            #EfRepository TEfRepository
+            #CreateEfRepository()* TEfRepository
+        }
+        class EfUnitOfWorkTDbContext {
+            +BeginTransactionAsync() Task~ITransaction~
+            +GetCurrentTransaction() ITransaction?
+            +ExecuteInTransactionAsync() Task
+        }
+        class EfTransactionAdapter {
+            +CommitAsync() Task
+            +RollbackAsync() Task
+            +DisposeAsync() ValueTask
+        }
+    }
+
+    IEntityTId --|> IEntity : extends
+    EntityTId ..|> IEntityTId : implements
+    Entity --|> EntityTId : extends (TId=Guid)
+    NamedEntity --|> Entity : extends
+
+    IEfRepositoryTEntityTId --|> IEfRepository : extends
+    IEfRepositoryTEntity --|> IEfRepositoryTEntityTId : extends (TId=int)
+    BaseEfRepositoryTDbContextTEntityTEntityId ..|> IEfRepositoryTEntityTId : implements
+    BaseRepositoryTEfRepositoryTDbContextTEntityTEntityId --> BaseEfRepositoryTDbContextTEntityTEntityId : uses (lazy)
+
+    EfUnitOfWorkTDbContext ..|> IUnitOfWork : implements
+    EfTransactionAdapter ..|> ITransaction : implements
+    EfUnitOfWorkTDbContext --> EfTransactionAdapter : creates
+```