Breaking change - bridge API key is mandatory

[cen1]

Description

Updated to 1.88.0 and startup fails:

cgw-web-1  | [Nest] 1  - 07/15/2025, 8:11:16 PM   ERROR [ExceptionHandler] TypeError: Configuration key "bridge.apiKey" does not exist
cgw-web-1  |     at ConfigService.getOrThrow (/node_modules/@nestjs/config/dist/config.service.js:132:19)
cgw-web-1  |     at NestConfigurationService.getOrThrow (/dist/src/config/nest.configuration.service.js:23:35)
cgw-web-1  |     at new BridgeApiFactory (/dist/src/datasources/bridge-api/bridge-api.factory.js:31:49)
cgw-web-1  |     at Injector.instantiateClass (/node_modules/@nestjs/core/injector/injector.js:373:19)
cgw-web-1  |     at callback (/node_modules/@nestjs/core/injector/injector.js:65:45)
cgw-web-1  |     at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
cgw-web-1  |     at async Injector.resolveConstructorParams (/node_modules/@nestjs/core/injector/injector.js:145:24)
cgw-web-1  |     at async Injector.loadInstance (/node_modules/@nestjs/core/injector/injector.js:70:13)
cgw-web-1  |     at async Injector.loadProvider (/node_modules/@nestjs/core/injector/injector.js:98:9)
cgw-web-1  |     at async Injector.lookupComponentInImports (/node_modules/@nestjs/core/injector/injector.js:297:17)

Setting BRIDGE_API_KEY=123456 allows the service to start up.

Reproduction steps

1. Run without bridge API key
2. Observe exception on startup

Expected behavior

Make config optional or document it

Additional information

No response