fix(#967): allow signUp endpoint to be disabled

[root5427]

🔗 Linked issue

#967

❓ Type of change

• 📖 Documentation (updates to the documentation, readme or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Documentation states that signUp endpoint may be disabled by setting it to false:

nuxt-auth/docs/guide/local/quick-start.md

Lines 54 to 67 in 8d31537

	You can customize each endpoint to fit your needs or disable it by setting it to `false`. For example you may want to disable the `signUp` endpoint.
	```ts{6}
	export default defineNuxtConfig({
	auth: {
	provider: {
	type: 'local',
	endpoints: {
	signUp: false
	}
	}
	}
	})
	```

But if you try to do this, you will get the following typescript error in your IDE:

Type 'false' has no properties in common with type '{ path?: string | undefined; method?: "head" | "get" | "patch" | "post" | "put" | "delete" | "connect" | "options" | "trace" | undefined; }'. ts(2559)

And the case where signUp endpoint is disabled is not handled by the signUp function of the useAuth composable:

nuxt-auth/src/runtime/composables/local/useAuth.ts

Lines 164 to 178 in 8d31537

	async function signUp(credentials: Credentials, signInOptions?: SecondarySignInOptions, signUpOptions?: SignUpOptions) {
	const nuxt = useNuxtApp()
	const { path, method } = useTypedBackendConfig(useRuntimeConfig(), 'local').endpoints.signUp
	await _fetch(nuxt, path, {
	method,
	body: credentials
	})
	if (signUpOptions?.preventLoginFlow) {
	return
	}
	return signIn(credentials, signInOptions)
	}

This PR should fix these issues.

📝 Checklist

• I have linked an issue or discussion.
• I have added tests (if possible).
• I have updated the documentation accordingly.

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commit: 8410502