feat: add email settings management

- Introduced EmailSettings component for managing SMTP services.
- Added API endpoints for organization email services including CRUD operations.
- Created database migrations for organization_email_settings and organization_email_services tables.
- Updated the settings page to include EmailSettings component.
- Implemented validation and error handling for email service operations.

services/cms-service/migrations/20260414000002_organization_email_settings.sql

@@ -0,0 +1,14 @@
+CREATE TABLE IF NOT EXISTS organization_email_settings (
+    organization_id UUID PRIMARY KEY REFERENCES organizations(id) ON DELETE CASCADE,
+    smtp_enabled BOOLEAN NOT NULL DEFAULT FALSE,
+    smtp_host TEXT,
+    smtp_port INTEGER NOT NULL DEFAULT 587,
+    smtp_from TEXT,
+    smtp_username TEXT,
+    smtp_password TEXT,
+    smtp_starttls BOOLEAN NOT NULL DEFAULT TRUE,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_org_email_settings_org_id ON organization_email_settings(organization_id);