🐛 (emails): fix evergreen events to not show tickets table and adjust greeting text

The tickets table email partial and tickets email template were not properly handling evergreen events: - The tickets table partial was conditionally hiding only some rows instead of the entire table - The tickets email greeting was including time/location placeholders that don't apply to evergreen events - Test was using incorrect URL path for checking evergreen events visibility

✨ (server.ts): add environment variable support for port configuration

💬 (event_validation.rb): set no_tickets_pdf to true by default in default_values method

♻️ Refactor evergreen filter to use cleaner MongoDB syntax

♻️ (test): refactor tests to use Rack::Test methods instead of custom raw_get helper

This commit replaces the custom raw_get helper method with standard Rack::Test methods. The app method is now the conventional way to define the application for testing, and using get with last_response provides a cleaner, more idiomatic approach to testing HTTP requests in Rack-based applications.

♻️ (evm.rb): remove unused _account parameter and add keyword splat for flexibility

💄 Update tests to match new UI copy and interaction for evergreen events

♻️ Prefixed unused account parameter with underscore in EVM payment method to follow Ruby convention

✨ Add evergreen/on-demand event type for courses without fixed dates

♻️ Split PaymentMethod into EventPaymentMethod and GatheringPaymentMethod

Refactor payment methods to separate concerns between events and gatherings. The monolithic PaymentMethod class is replaced by two distinct classes, each with their own payment processors, improving maintainability and clarity of the codebase.

🐛 (tickets.erb): remove "tickets are attached" message when no tickets PDF exists

♻️ Extract payment handlers into dedicated modules for events and gatherings

♻️ Extract duplicated EVM payment logic into reusable runEvmPaymentFlow function

♻️ Normalize payment API response field names by removing evm_ prefix from value fields

♻️ (stripe.rb): rename organisationship variable to revenue_sharer_organisationship for clarity

⚰️ Remove outdated comment from order_currency_for method

♻️ Refactor payment condition logic to separate org and event concerns This commit: - Renames condition to event_condition for clarity - Consolidates org_condition checks into available? method to avoid duplication - Simplifies lambda syntax using method references where applicable

♻️ Remove logo and url attributes from PaymentMethod class

Simplify PaymentMethod model by moving logo and URL data directly into the view, eliminating unnecessary attributes and options.

🐛 Fix payment method validation to check availability per event

This change adds a critical available? check in the payment processing flow to ensure payment methods are genuinely available for a specific event before attempting to process payments. The check complements the existing condition validation by providing an additional availability layer that can evaluate dynamic per-event constraints.

♻️ Extract payment method processing logic into separate module files

♻️ Move order currency logic to PaymentMethod class

Extract currency mapping from helper to allow payment methods to define their own order_currency_for behavior