feat: improve hooks validation and expand test coverage

[Sgulli]

What

Improved hooks validation, expanded test coverage, and enhanced code quality for NestJS Better Auth integration

Changes

• Improved hooks flexibility: Allow undefined hooks when no @hook providers exist (no workarounds needed)
• Enhanced test coverage: Added 17+ new tests across REST, GraphQL, and hooks validation
• Added test utilities: generateTestUser() and signUpTestUser() helpers
• Refactored forRoot() logic: Simplified with isNewFormat variable and addGuardProvider() helper
• Improved CORS handling: Better variable names and cleaner conditional logic
• Enhanced type safety: Added RequestWithSession type for better session typing
• Updated dependencies: Apollo Server@5, Biome@2.2.5, @nestjs/apollo@13.2.1, @nestjs/graphql@13.2.0,
• added @as-integrations/express5 as requested by the error stack
• Fixed test controllers: Use @Session decorator consistently across REST and GraphQL

Testing

[x] Added comprehensive hooks validation tests (6 scenarios)
[x] Expanded REST auth tests with invalid token cases
[x] Expanded GraphQL auth tests with edge cases
[x] Added test helper utilities for cleaner code
[x] Extracted helper methods following DRY principle
[x] Updated dependencies for GraphQL compatibility
[x] Verified all tests pass with improved coverage

Build

Does it build? Yes

bun run build                        
$ unbuild
ℹ Automatically detected entries: src/index [esm] [cjs] [dts]                          23:44:49
ℹ Building nestjs-better-auth                                                          23:44:49
ℹ Cleaning dist directory: ./dist                                                      23:44:49
✔ Build succeeded for nestjs-better-auth                                               23:44:51

Output

File	Size	Chunk	Exports
dist/index.cjs	11.1 kB	11.1 kB	AFTER_HOOK_KEY, AUTH_MODULE_OPTIONS_KEY, AfterHook, AllowAnonymous, AuthGuard, AuthModule, AuthService, BEFORE_HOOK_KEY, BeforeHook, HOOK_KEY, Hook, Optional, OptionalAuth, Public, Session
dist/index.mjs	10.6 kB	10.6 kB	AFTER_HOOK_KEY, AUTH_MODULE_OPTIONS_KEY, AfterHook, AllowAnonymous, AuthGuard, AuthModule, AuthService, BEFORE_HOOK_KEY, BeforeHook, HOOK_KEY, Hook, Optional, OptionalAuth, Public, Session

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Σ Total dist size (byte size): 40.5 kB

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commit: d21f556