feat: add multiple provider support (#3089)

* Remove `crewai signup` command, update docs

* Add `Settings.clear()` and clear settings before each login

* Add pyjwt

* Remove print statement from ToolCommand.login()

* Remove auth0 dependency

* Update docs

docs/en/concepts/cli.mdx

@@ -4,6 +4,8 @@ description: Learn how to use the CrewAI CLI to interact with CrewAI.
 icon: terminal
 ---
 
+<Warning>Since release 0.140.0, CrewAI Enterprise started a process of migrating their login provider. As such, the authentication flow via CLI was updated. Users that use Google to login, or that created their account after July 3rd, 2025 will be unable to log in with older versions of the `crewai` library.</Warning>
+
 ## Overview
 
 The CrewAI CLI provides a set of commands to interact with CrewAI, allowing you to create, train, run, and manage crews & flows.
@@ -186,10 +188,7 @@ def crew(self) -> Crew:
 Deploy the crew or flow to [CrewAI Enterprise](https://app.crewai.com).
 
 - **Authentication**: You need to be authenticated to deploy to CrewAI Enterprise.
-    ```shell Terminal
-    crewai signup
-    ```
-    If you already have an account, you can login with:
+    You can login or create an account with:
     ```shell Terminal
     crewai login
     ```

docs/en/enterprise/guides/deploy-crew.mdx

@@ -41,11 +41,8 @@ The CLI provides the fastest way to deploy locally developed crews to the Enterp
     First, you need to authenticate your CLI with the CrewAI Enterprise platform:
 
     ```bash
-    # If you already have a CrewAI Enterprise account
+    # If you already have a CrewAI Enterprise account, or want to create one:
     crewai login
-
-    # If you're creating a new account
-    crewai signup
     ```
 
     When you run either command, the CLI will:

docs/pt-BR/concepts/cli.mdx

@@ -3,6 +3,7 @@ title: CLI
 description: Aprenda a usar o CLI do CrewAI para interagir com o CrewAI.
 icon: terminal
 ---
+<Warning>A partir da versão 0.140.0, a plataforma CrewAI Enterprise iniciou um processo de migração de seu provedor de login. Como resultado, o fluxo de autenticação via CLI foi atualizado. Usuários que utlizam o Google para fazer login, ou que criaram conta após 3 de julho de 2025 não poderão fazer login com versões anteriores da biblioteca `crewai`.</Warning>
 
 ## Visão Geral
 

docs/pt-BR/enterprise/guides/deploy-crew.mdx

@@ -41,11 +41,8 @@ A CLI fornece a maneira mais rápida de implantar crews desenvolvidos localmente
     Primeiro, você precisa autenticar sua CLI com a plataforma CrewAI Enterprise:
 
     ```bash
-    # Se já possui uma conta CrewAI Enterprise
+    # Se já possui uma conta CrewAI Enterprise, ou deseja criar uma:
     crewai login
-
-    # Se vai criar uma nova conta
-    crewai signup
     ```
 
     Ao executar qualquer um dos comandos, a CLI irá: