Add Support Documentation with Payment Section (English & Chinese)

[mintlify]

Added comprehensive support documentation section with payment information for both English and Chinese versions. Created 12 new pages covering payment methods, billing management, troubleshooting, and account settings for Comfy Organization Inc users.

Files changed:

• docs.json (updated navigation structure)
• support/payment/accepted-payment-methods.mdx (new)
• support/payment/editing-payment-information.mdx (new)
• support/payment/payment-history.mdx (new)
• support/payment/unsuccessful-payments.mdx (new)
• support/payment/payment-currency.mdx (new)
• support/payment/invoice-information.mdx (new)
• zh-CN/support/payment/accepted-payment-methods.mdx (new)
• zh-CN/support/payment/editing-payment-information.mdx (new)
• zh-CN/support/payment/payment-history.mdx (new)
• zh-CN/support/payment/unsuccessful-payments.mdx (new)
• zh-CN/support/payment/payment-currency.mdx (new)
• zh-CN/support/payment/invoice-information.mdx (new)

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Created by Mintlify agent