fix(server): realtime loading (#14959)

#### PR Dependency Tree


* **PR #14959** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Refactor**
* Rewired realtime and copilot services to require their runtime
dependencies, improving reliability and removing nullable/optional
runtime paths.

* **Tests**
* Centralized service creation in tests with helper factories and added
checks ensuring realtime dependency injection is configured as expected.

<!-- review_stack_entry_start -->

[![Review Change
Stack](https://storage.googleapis.com/coderabbit_public_assets/review-stack-in-coderabbit-ui.svg)](https://app.coderabbit.ai/change-stack/toeverything/AFFiNE/pull/14959)

<!-- review_stack_entry_end -->
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/plugins/copilot/context/realtime.ts

@@ -1,4 +1,4 @@
-import { Injectable, OnModuleInit, Optional } from '@nestjs/common';
+import { Injectable, OnModuleInit } from '@nestjs/common';
 import { z } from 'zod';
 
 import { OnEvent } from '../../../base';
@@ -22,8 +22,8 @@ export class CopilotEmbeddingRealtimeProvider implements OnModuleInit {
     private readonly ac: AccessController,
     private readonly models: Models,
     private readonly context: CopilotContextService,
-    @Optional() private readonly registry?: RealtimeRegistry,
-    @Optional() private readonly publisher?: RealtimePublisher
+    private readonly registry: RealtimeRegistry,
+    private readonly publisher: RealtimePublisher
   ) {}
 
   onModuleInit() {

packages/backend/server/src/plugins/copilot/transcript/realtime.ts

@@ -1,10 +1,10 @@
-import { Injectable, OnModuleInit, Optional } from '@nestjs/common';
+import { Injectable, OnModuleInit } from '@nestjs/common';
 import { z } from 'zod';
 
 import { CopilotTranscriptionJobNotFound } from '../../../base';
 import { AccessController } from '../../../core/permission';
 import {
-  type RealtimeRegistry,
+  RealtimeRegistry,
   realtimeTranscriptTaskRoom,
   registerRealtimeLiveQuery,
 } from '../../../core/realtime';
@@ -15,7 +15,7 @@ export class CopilotTranscriptRealtimeProvider implements OnModuleInit {
   constructor(
     private readonly ac: AccessController,
     private readonly transcript: CopilotTranscriptionReader,
-    @Optional() private readonly registry?: RealtimeRegistry
+    private readonly registry: RealtimeRegistry
   ) {}
 
   onModuleInit() {

packages/backend/server/src/plugins/copilot/transcript/service.ts

@@ -1,4 +1,4 @@
-import { BadRequestException, Injectable, Optional } from '@nestjs/common';
+import { BadRequestException, Injectable } from '@nestjs/common';
 import { AiJobStatus } from '@prisma/client';
 
 import {
@@ -10,7 +10,7 @@ import {
   sniffMime,
 } from '../../../base';
 import {
-  type RealtimePublisher,
+  RealtimePublisher,
   realtimeTranscriptTaskRoom,
 } from '../../../core/realtime';
 import { Models } from '../../../models';
@@ -45,8 +45,8 @@ export class CopilotTranscriptionService {
     private readonly tasks: TaskPolicy,
     private readonly prompts: PromptService,
     private readonly actionBridge: ActionRuntimeBridge,
-    @Optional() private readonly access?: CopilotAccessPolicy,
-    @Optional() private readonly realtime?: RealtimePublisher
+    private readonly access: CopilotAccessPolicy,
+    private readonly realtime: RealtimePublisher
   ) {}
 
   private parseTaskPayload(payload: unknown): TranscriptionPayloadV2 {
@@ -180,7 +180,7 @@ export class CopilotTranscriptionService {
       throw new CopilotTranscriptionJobExists();
     }
 
-    await this.access?.assertQuotaOrByok({
+    await this.access.assertQuotaOrByok({
       userId,
       workspaceId,
       featureKind: 'transcript',
@@ -234,7 +234,7 @@ export class CopilotTranscriptionService {
       );
     }
 
-    await this.access?.assertQuotaOrByok({
+    await this.access.assertQuotaOrByok({
       userId,
       workspaceId,
       featureKind: 'transcript',
@@ -282,7 +282,7 @@ export class CopilotTranscriptionService {
       return taskToJob(task);
     }
 
-    await this.access?.assertQuotaOrByok({
+    await this.access.assertQuotaOrByok({
       userId,
       workspaceId,
       featureKind: 'transcript',
@@ -412,7 +412,7 @@ export class CopilotTranscriptionService {
     status: AiJobStatus,
     error?: string
   ) {
-    this.realtime?.publish(
+    this.realtime.publish(
       'copilot.transcript.task.changed',
       { workspaceId, taskId },
       { taskId, status, error },