fix: Add AuthModule import to GraphModule

🔧 Fix GraphModule Dependency Injection

## Issue Fixed:
- Backend still failing with GraphModule dependency error
- GraphModule missing AuthModule import for JwtAuthGuard
- GraphController uses JwtAuthGuard but GraphModule doesn't have AuthService

## Solution:
- Added AuthModule import to GraphModule
- GraphModule now has access to AuthService
- JwtAuthGuard can now resolve AuthService dependency

## Key Change:
- GraphModule: Added AuthModule import
- GraphController: Now has access to AuthService via AuthModule

This completes the dependency injection fixes for all modules
using JwtAuthGuard in the NestJS application.

Author: gnowgi

nodebook-base/src/graph/graph.module.ts

@@ -6,9 +6,10 @@ import { DataStoreService } from './services/data-store.service.js';
 import { GraphManagerService } from './services/graph-manager.service.js';
 import { CNLParserService } from './services/cnl-parser.service.js';
 import { CNLSuggestionService } from './services/cnl-suggestion.service.js';
+import { AuthModule } from '../auth/auth.module.js';
 
 @Module({
-  imports: [ConfigModule],
+  imports: [ConfigModule, AuthModule],
   controllers: [GraphController],
   providers: [
     GraphService,