新增系统配置页（运营管理系统后台）

backend/src/models/Config.ts

@@ -0,0 +1,25 @@
+import { Entity, PrimaryGeneratedColumn, Column, CreateDateColumn, UpdateDateColumn } from 'typeorm';
+
+@Entity('configs')
+export class Config {
+  @PrimaryGeneratedColumn('increment')
+  id: number;
+
+  @Column({ type: 'varchar', length: 100, unique: true, name: 'config_key' })
+  configKey: string;
+
+  @Column({ type: 'text', name: 'config_value' })
+  configValue: string;
+
+  @Column({ type: 'varchar', length: 50, name: 'config_type' })
+  configType: string;
+
+  @Column({ type: 'varchar', length: 255, nullable: true })
+  description: string;
+
+  @CreateDateColumn({ name: 'created_at' })
+  createdAt: Date;
+
+  @UpdateDateColumn({ name: 'updated_at' })
+  updatedAt: Date;
+}