feat: option to disable anonymous accounts

[Schwehn42]

Description

This PR adds the option to disable anonymous accounts.
When disabled (either by using the CLI flag disable-anonymous-login or in the config.toml), new instances of anonymous accounts cannot be created. Instead, only active providers (Google, Apple, etc.) can be used.
In the frontend, the button is also grayed out (subject to change?)
Closes #4169.

Note: Already logged in acounts can be still used

Changelog

backend

• main
  • Add CLI flag disable-anonymous-login and config entry
• router
  • add flag to Server struct
  • use context AnonymousLoginDisabledContext for route /login/anonymous
• AnonymousLoginDisabledContext
  • check flag disable-anonymous-login, and throw error if false
• info
  • add to info struct

frontend

• store
  • adjust info state to include disableAnonymousLogin
• LoginBoard
  • conditionally gray out anon login form

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• The light- and dark-theme are both supported and tested
• The design was implemented and is responsive for all devices and screen sizes
• The application was tested in the most commonly used browsers (e.g. Chrome, Firefox, Safari)

(Optional) Visual Changes

[octomind-dev]

🐙 Octomind

Test Report: 0/14 successful.

description	status	details
About Section Visibility Test	Failed ❌	click
change avatar	Failed ❌	click
check Privacy Policy	Failed ❌	click
check terms & conditions	Failed ❌	click
close cookie banner - front page	Failed ❌	click
close cookie banner - sign-in	Failed ❌	click
create and delete board columns	Failed ❌	click
create_and_delete_notes_and_actions_v2	Failed ❌	click
create lean coffee board	Failed ❌	click
edit_notes_and_actions_v5	Failed ❌	click
get started	Failed ❌	click
share_session	Failed ❌	click
sign-in	Failed ❌	click
test all ways to open the setup flow	Failed ❌	click

commit sha: 6f91c38

[octomind-dev]

🐙 Octomind

Test Report: 0/14 successful.

description	status	details
About Section Visibility Test	Failed ❌	click
change avatar	Failed ❌	click
check Privacy Policy	Failed ❌	click
check terms & conditions	Failed ❌	click
close cookie banner - front page	Failed ❌	click
close cookie banner - sign-in	Failed ❌	click
create and delete board columns	Failed ❌	click
create_and_delete_notes_and_actions_v2	Failed ❌	click
create lean coffee board	Failed ❌	click
edit_notes_and_actions_v5	Failed ❌	click
get started	Failed ❌	click
share_session	Failed ❌	click
sign-in	Failed ❌	click
test all ways to open the setup flow	Failed ❌	click

commit sha: 0e9a808

[mateo-ivc]

lgtm

[github-actions]

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[octomind-dev]

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Test Report: 13/14 successful.

description	status	details
About Section Visibility Test	Passed ✅	click
change avatar	Passed ✅	click
check Privacy Policy	Passed ✅	click
check terms & conditions	Passed ✅	click
close cookie banner - front page	Passed ✅	click
close cookie banner - sign-in	Passed ✅	click
create and delete board columns	Passed ✅	click
create_and_delete_notes_and_actions_v2	Failed ❌	click
create lean coffee board	Passed ✅	click
edit_notes_and_actions_v5	Passed ✅	click
get started	Passed ✅	click
share_session	Passed ✅	click
sign-in	Passed ✅	click
test all ways to open the setup flow	Passed ✅	click

commit sha: 0c0742d