feat(server): allow customize server external url (#7270)

closes https://github.com/toeverything/AFFiNE/issues/7252

packages/backend/server/src/fundamentals/nestjs/config.ts

@@ -1,29 +1,25 @@
 import { defineStartupConfig, ModuleConfig } from '../../fundamentals/config';
 
 export interface ServerStartupConfigurations {
+  /**
+   * Base url of AFFiNE server, used for generating external urls.
+   * default to be `[AFFiNE.protocol]://[AFFiNE.host][:AFFiNE.port]?[AFFiNE.path]` if not specified
+   */
+  externalUrl: string;
   /**
    * Whether the server is hosted on a ssl enabled domain
    */
   https: boolean;
   /**
-   * where the server get deployed.
-   *
-   * @default 'localhost'
-   * @env AFFINE_SERVER_HOST
+   * where the server get deployed(FQDN).
    */
   host: string;
   /**
    * which port the server will listen on
-   *
-   * @default 3010
-   * @env AFFINE_SERVER_PORT
    */
   port: number;
   /**
    * subpath where the server get deployed if there is.
-   *
-   * @default '' // empty string
-   * @env AFFINE_SERVER_SUB_PATH
    */
   path: string;
 }
@@ -35,6 +31,7 @@ declare module '../../fundamentals/config' {
 }
 
 defineStartupConfig('server', {
+  externalUrl: '',
   https: false,
   host: 'localhost',
   port: 3010,