Add ZPay and Stripe payment documentation and images

[ruibaby]

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[Copilot]

Pull request overview

This pull request adds comprehensive documentation for two new payment methods: ZPay (易支付) and Stripe. The changes include detailed setup instructions, API configuration guides, webhook setup, and visual aids.

Changes:

• Added ZPay payment method documentation with registration, channel setup, and Halo configuration instructions
• Added Stripe payment method documentation with account setup, API key retrieval, webhook configuration, and Halo integration steps
• Updated terminology from "是否启用" to "启用" across all payment method configuration sections for consistency
• Updated screenshot reference from settings-payments-create.png to settings-payments-create-2.23.png to reflect UI changes
• Added new image file settings-payments-stripe-4.png for webhook endpoint configuration

Reviewed changes

Copilot reviewed 1 out of 13 changed files in this pull request and generated 1 comment.

File	Description
docs/user-guide/shop/payments.mdx	Added comprehensive documentation for ZPay and Stripe payment methods, updated terminology consistency, and added all necessary cross-references
static/img/user-guide/shop/settings-payments-stripe-4.png	New screenshot image for Stripe webhook endpoint type selection step

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