Enhance employee and user management with linked user functionality

- Introduced `EmployeeUserWrite` type to manage user details associated with employees.
- Updated `EmployeesService` and `EmployeesRepository` to support user assignment and retrieval by user ID.
- Enhanced DTOs to include user information for employee creation and updates.
- Implemented validation to ensure proper handling of user data during employee operations.
- Added unit and e2e tests to validate the new functionality and ensure data integrity in user-employee relationships.
- Modified existing controllers to accommodate the new user linkage features in employee management.

src/modules/configuration/employees/employees.repository.ts

@@ -66,7 +66,9 @@ export class EmployeesRepository {
       .where(eq(employees.id, id))
       .limit(1);
     const row = rows[0];
-    return row ? this.toDomain(row, await this.loadAssignedUser(row.userId)) : null;
+    return row
+      ? this.toDomain(row, await this.loadAssignedUser(row.userId))
+      : null;
   }
 
   async findByCode(code: string): Promise<Employee | null> {
@@ -76,7 +78,21 @@ export class EmployeesRepository {
       .where(eq(employees.code, code))
       .limit(1);
     const row = rows[0];
-    return row ? this.toDomain(row, await this.loadAssignedUser(row.userId)) : null;
+    return row
+      ? this.toDomain(row, await this.loadAssignedUser(row.userId))
+      : null;
+  }
+
+  async findByUserId(userId: string): Promise<Employee | null> {
+    const rows = await this.db
+      .select()
+      .from(employees)
+      .where(eq(employees.userId, userId))
+      .limit(1);
+    const row = rows[0];
+    return row
+      ? this.toDomain(row, await this.loadAssignedUser(row.userId))
+      : null;
   }
 
   async create(input: CreateEmployeeInput): Promise<Employee> {
@@ -321,7 +337,10 @@ export class EmployeesRepository {
     throw error;
   }
 
-  private unwrapDbError(error: unknown): { code?: string; constraint?: string } {
+  private unwrapDbError(error: unknown): {
+    code?: string;
+    constraint?: string;
+  } {
     let current: unknown = error;
     for (let i = 0; i < 5; i++) {
       if (!current || typeof current !== 'object') {