Expand Pelcro's Default Email Templates

Problem Statement

Pelcro currently supports only a limited set of default transactional emails. Clients must rely on external webhook + Postmark setups, creating fragmented workflows and inconsistent branding.

User Story

As a Pelcro client,
I want a centralized page to manage automated emails tied to Pelcro events,
So that I can enable and preview system emails without external setup.

Proposed Solution

Introduce an Email Center in the dashboard:

Predefined, hardcoded email templates mapped to webhook events
Toggle per email (enable / disable)
Preview (read-only)
Automatic branding (logo + colors from platform config)
Emails triggered directly from Pelcro events

Definition of Done (DoD)

Email Center page listing all system emails
Each email includes:
- Name
- Enable/disable toggle
- Preview

API

GET /email-templates
PATCH /email-templates/{id}
Event-driven email trigger layer

Email Templates (Default List)
System must include, at minimum, emails for:

Billing & Payments

Invoice Created
Invoice Paid
Invoice Payment Failed
Refund Issued

Subscriptions

Subscription Created
Subscription Renewed
Subscription Updated
Subscription Canceled

Dunning / Recovery

Payment Failed (retry notification)
Card Expiring Soon

Customer / Account

Account Created
Password Reset

Optional (if present in webhook scope)

Donation Created
Order/One-time Purchase Confirmation

Behavior

Email is sent when:
- Corresponding event is triggered
- Email is enabled

Branding

Apply platform color configuration
Apply client logo dynamically