Fix WeChat League API URL patterns to resolve error 48001

[Copilot]

This PR fixes incorrect URL patterns in the WeChat Channel League API that were causing error 48001 ("没有该接口权限" - no interface permission) for users.

Problem

Users reported that some League API interfaces were returning error code 48001, while GET_SUPPLIER_ORDER_LIST_URL worked correctly. Analysis revealed that several URLs were using inconsistent patterns compared to the official WeChat API specification.

Root Cause

The working URL follows this pattern:

GET_SUPPLIER_ORDER_LIST_URL = "https://api.weixin.qq.com/channels/ec/league/headsupplier/order/list/get"

But other URLs were using deprecated or incorrect patterns like /getall, /getdetail, and /flowdetail/get.

Changes Made

Window-related URLs

// Before (incorrect)
LIST_SUPPLIER_GOODS_URL = ".../window/getall"
GET_SUPPLIER_GOODS_URL = ".../window/getdetail"

// After (corrected)
LIST_SUPPLIER_GOODS_URL = ".../window/list/get"
GET_SUPPLIER_GOODS_URL = ".../window/get"

Flow-related URLs

// Before (incorrect)
GET_SUPPLIER_BALANCE_FLOW_DETAIL_URL = ".../funds/flowdetail/get"
GET_SUPPLIER_BALANCE_FLOW_LIST_URL = ".../funds/flowlist/get"

// After (corrected)
GET_SUPPLIER_BALANCE_FLOW_DETAIL_URL = ".../funds/flow/detail/get"
GET_SUPPLIER_BALANCE_FLOW_LIST_URL = ".../funds/flow/list/get"

Pattern Consistency Rules Applied

1. List endpoints: Should end with /list/get
2. Detail/Get endpoints: Should end with /get (not /getdetail or /getall)
3. Nested resources: Should use proper path separation

Validation

• ✅ All changes compile successfully
• ✅ No breaking changes to existing code
• ✅ Added comprehensive test suite to validate URL pattern consistency
• ✅ URLs now follow the same pattern as the confirmed working reference URL

This should resolve the 48001 error for the affected League API endpoints.

Fixes #3630.

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