[EPIC-002] feat: Add user_id to Employee + rename warehouse_type

T2.1: Renamed warehouse_type -> construction_warehouse_type
      to avoid conflict with ERP-Core warehouses.warehouse_type

T2.3: Added user_id FK to hr.employees for employee-user mapping
      - Nullable (employees can exist without system access)
      - Unique constraint (1:1 relationship)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/modules/hr/entities/employee.entity.ts

@@ -29,6 +29,7 @@ export type Genero = 'M' | 'F';
 @Entity({ schema: 'hr', name: 'employees' })
 @Index(['tenantId', 'codigo'], { unique: true })
 @Index(['tenantId', 'curp'], { unique: true })
+@Index(['userId'], { unique: true })
 export class Employee {
   @PrimaryGeneratedColumn('uuid')
   id: string;
@@ -111,6 +112,10 @@ export class Employee {
   @Column({ name: 'created_by', type: 'uuid', nullable: true })
   createdById: string;
 
+  // Mapeo a usuario del sistema (opcional - empleado puede no tener acceso)
+  @Column({ name: 'user_id', type: 'uuid', nullable: true })
+  userId: string;
+
   // Relations
   @ManyToOne(() => Tenant)
   @JoinColumn({ name: 'tenant_id' })
@@ -124,6 +129,11 @@ export class Employee {
   @JoinColumn({ name: 'created_by' })
   createdBy: User;
 
+  // Relación a usuario del sistema (1:1, opcional)
+  @ManyToOne(() => User, { nullable: true })
+  @JoinColumn({ name: 'user_id' })
+  user: User;
+
   @OneToMany(() => EmployeeFraccionamiento, (ef) => ef.employee)
   asignaciones: EmployeeFraccionamiento[];
 

src/modules/inventory/entities/almacen-proyecto.entity.ts

@@ -40,12 +40,12 @@ export class AlmacenProyecto {
   fraccionamientoId: string;
 
   @Column({
-    name: 'warehouse_type',
+    name: 'construction_warehouse_type',
     type: 'varchar',
     length: 20,
     default: 'obra',
   })
-  warehouseType: WarehouseTypeConstruction;
+  constructionWarehouseType: WarehouseTypeConstruction;
 
   @Column({ name: 'location_description', type: 'text', nullable: true })
   locationDescription: string;