feat: replace tenants with organization management

apps/server/src/entities/organization.entity.ts

@@ -0,0 +1,46 @@
+import {
+  Entity,
+  PrimaryGeneratedColumn,
+  Column,
+  CreateDateColumn,
+  UpdateDateColumn,
+} from 'typeorm';
+
+@Entity('organizations')
+export class Organization {
+  @PrimaryGeneratedColumn()
+  id: number;
+
+  @Column({ name: 'public_id', type: 'varchar', length: 36, unique: true })
+  publicId: string;
+
+  @Column({ length: 50, unique: true })
+  code: string;
+
+  @Column({ length: 100 })
+  name: string;
+
+  @Column({ name: 'is_host', default: false })
+  isHost: boolean;
+
+  @Column({ name: 'contact_name', length: 50, nullable: true })
+  contactName: string;
+
+  @Column({ length: 30, nullable: true })
+  phone: string;
+
+  @Column({ length: 20, nullable: true })
+  color: string;
+
+  @Column({ type: 'text', nullable: true })
+  notes: string;
+
+  @Column({ type: 'varchar', length: 20, default: 'active' })
+  status: 'active' | 'archived';
+
+  @CreateDateColumn({ name: 'created_at' })
+  createdAt: Date;
+
+  @UpdateDateColumn({ name: 'updated_at' })
+  updatedAt: Date;
+}