feat(billing): add configuration for trial signup card requirement

Introduced a new environment variable `REQUIRE_CARD_FOR_TRIAL` to control whether a credit card is required for trial signups. Updated the billing configuration to reflect this setting, allowing for more flexible trial management.

Author: paulocastellano

.env.example

@@ -171,6 +171,8 @@ AI_AUDIO_PROVIDER=elevenlabs
 STRIPE_KEY=
 STRIPE_SECRET=
 STRIPE_WEBHOOK_SECRET=
+# Set to false to allow generic signup trial without requiring a card.
+REQUIRE_CARD_FOR_TRIAL=true
 
 # Stripe Plan Price IDs (one per plan × interval). Used by PlanSeeder.
 STRIPE_STARTER_MONTHLY=

config/trypost.php

@@ -28,7 +28,7 @@
     */
 
     'billing' => [
-        'require_card_for_trial' => true,
+        'require_card_for_trial' => (bool) env('REQUIRE_CARD_FOR_TRIAL', true),
     ],
 
     /*