feat: add Dockerfiles and MySQL TypeORM wiring for center/guild backends

Fabric.Backend.Center/src/entities/user.entity.ts

@@ -0,0 +1,16 @@
+import { Column, CreateDateColumn, Entity, PrimaryGeneratedColumn } from 'typeorm';
+
+@Entity('users')
+export class User {
+  @PrimaryGeneratedColumn('uuid')
+  id!: string;
+
+  @Column({ unique: true })
+  email!: string;
+
+  @Column()
+  passwordHash!: string;
+
+  @CreateDateColumn()
+  createdAt!: Date;
+}