[cli] Improve support handling passkey login for selfhost (#6328)

## Description
Removed the need for specifying account's app url as server returns the
same in the response to auth challenge.

## Tests

cli/config.yaml.example

@@ -5,8 +5,6 @@
 
 endpoint:
   api: "http://localhost:8080"
-  # Endpoint for the account service for passkey
-  accounts: "http://localhost:3001"
 
 log:
  http: false # log status code & time taken by requests

cli/internal/api/login_type.go

@@ -35,6 +35,7 @@ type AuthorizationResponse struct {
 	ID                 int64          `json:"id"`
 	KeyAttributes      *KeyAttributes `json:"keyAttributes,omitempty"`
 	EncryptedToken     string         `json:"encryptedToken,omitempty"`
+	AccountsUrl        string         `json:"accountsUrl"`
 	Token              string         `json:"token,omitempty"`
 	TwoFactorSessionID string         `json:"twoFactorSessionID"`
 	PassKeySessionID   string         `json:"passkeySessionID"`

cli/main.go

@@ -110,7 +110,6 @@ func initConfig(cliConfigDir string) {
 	viper.AddConfigPath(".")                // optionally look for config in the working directory
 
 	viper.SetDefault("endpoint.api", constants.EnteApiUrl)
-	viper.SetDefault("endpoint.accounts", constants.EnteAccountUrl)
 	viper.SetDefault("log.http", false)
 	if err := viper.ReadInConfig(); err != nil {
 		if _, ok := err.(viper.ConfigFileNotFoundError); ok {

cli/pkg/sign_in.go

@@ -8,8 +8,8 @@ import (
 	eCrypto "github.com/ente-io/cli/internal/crypto"
 	"github.com/ente-io/cli/pkg/model"
 	"github.com/ente-io/cli/utils/browser"
+	"github.com/ente-io/cli/utils/constants"
 	"github.com/ente-io/cli/utils/encoding"
-	"github.com/spf13/viper"
 	"log"
 
 	"github.com/kong/go-srp"
@@ -145,7 +145,10 @@ func (c *ClICtrl) verifyPassKey(ctx context.Context, authResp *api.Authorization
 	if !authResp.IsPasskeyRequired() {
 		return authResp, nil
 	}
-	baseAccountUrl := viper.GetString("endpoint.accounts")
+	baseAccountUrl := constants.EnteAccountUrl
+	if authResp.AccountsUrl != "" {
+		baseAccountUrl = authResp.AccountsUrl
+	}
 	passkeyAuthUrl := fmt.Sprintf("%s/passkeys/verify?passkeySessionID=%s&redirect=ente-cli://passkey&clientPackage=%s", baseAccountUrl, authResp.PassKeySessionID, app.ClientPkg())
 	fmt.Printf("Open this url in browser to verify passkey: %s\n", passkeyAuthUrl)
 	err := browser.OpenURL(passkeyAuthUrl)