docs: update endpoints to use file-routing approach (#5397)

- Move the original guides for creating endpoints and middlewares to sub-sections in the Endpoints category.
- Replace existing guides for endpoints and middlewares with the new approach.
- Update all endpoints-related snippets across docs to use this new approach.

www/apps/docs/content/modules/price-lists/admin/_import-prices.mdx

@@ -137,7 +137,7 @@ You can learn more about [authenticating as an admin user in the API reference](
 
 Before importing the prices, you must have a price list to import them to.
 
-You can use the [Create Price List](https://docs.medusajs.com/api/admin#price-lists_postpricelistspricelist) endpoint, or follow the [how-to guide to learn how to create and manage price lists using the Admin API](./manage-price-lists.mdx).
+You can use the [Create Price List API Route](https://docs.medusajs.com/api/admin#price-lists_postpricelistspricelist), or follow the [how-to guide to learn how to create and manage price lists using the Admin API](./manage-price-lists.mdx).
 
 ---
 
@@ -145,7 +145,7 @@ You can use the [Create Price List](https://docs.medusajs.com/api/admin#price-li
 
 The first step is to upload the CSV file to import prices from.
 
-You can do that by sending the following request to the [Upload Files](https://docs.medusajs.com/api/admin#uploads_postuploads) endpoint:
+You can do that by sending the following request to the [Upload Files API Route](https://docs.medusajs.com/api/admin#uploads_postuploads):
 
 <Tabs groupId="request-type" isCodeTabs={true}>
 <TabItem value="client" label="Medusa JS Client" default>
@@ -219,7 +219,7 @@ This request returns an array of uploads. Each item in the array is an object th
 
 To start a new price import, you must create a batch job.
 
-You can do that by sending the following request to the [Create a Batch Job](https://docs.medusajs.com/api/admin#batch-jobs_postbatchjobs) endpoint:
+You can do that by sending the following request to the [Create a Batch Job API Route](https://docs.medusajs.com/api/admin#batch-jobs_postbatchjobs):
 
 <Tabs groupId="request-type" isCodeTabs={true}>
 <TabItem value="client" label="Medusa JS Client" default>

www/apps/docs/content/modules/price-lists/admin/manage-price-lists.mdx

@@ -230,7 +230,7 @@ You can check the full list of request body parameters in the [API reference](ht
 
 ## Get Price List’s Details
 
-You can retrieve all of a price list’s details using the Get a Price List endpoint:
+You can retrieve all of a price list’s details using the Get a Price List API Route:
 
 <Tabs groupId="request-type" isCodeTabs={true}>
 <TabItem value="client" label="Medusa JS Client" default>
@@ -294,7 +294,7 @@ curl -L -X GET '<BACKEND_URL>/admin/price-lists/{id}' \
 
 ## Update a Price List
 
-After creating a price list, you can update all of its fields including its status, prices, and more using the [Update Price List](https://docs.medusajs.com/api/admin#price-lists_postpricelistspricelistpricelist) endpoint.
+After creating a price list, you can update all of its fields including its status, prices, and more using the [Update Price List API Route](https://docs.medusajs.com/api/admin#price-lists_postpricelistspricelistpricelist).
 
 For example, by sending the following request the end date of the price list will be updated:
 
@@ -381,7 +381,7 @@ For a full list of request body parameters, check out the [API reference](https:
 
 ### Add Prices
 
-You can add prices to your price list after creating it using the [Update Prices](https://docs.medusajs.com/api/admin#price-lists_postpricelistspricelistpricesbatch) endpoint.
+You can add prices to your price list after creating it using the [Update Prices API Route](https://docs.medusajs.com/api/admin#price-lists_postpricelistspricelistpricesbatch).
 
 You can also set the `override` request body parameter to `true` to replace the existing prices in the price list.
 
@@ -488,7 +488,7 @@ For a full list of request body parameters, check out the [API reference](https:
 
 ### Delete a Product’s Prices
 
-You can delete all the prices of a product’s variants using the [Delete Product Prices](https://docs.medusajs.com/api/admin#price-lists_deletepricelistspricelistpricesbatch) endpoint:
+You can delete all the prices of a product’s variants using the [Delete Product Prices API Route](https://docs.medusajs.com/api/admin#price-lists_deletepricelistspricelistpricesbatch):
 
 <Tabs groupId="request-type" isCodeTabs={true}>
 <TabItem value="client" label="Medusa JS Client" default>
@@ -562,7 +562,7 @@ This request returns the IDs of the deleted prices.
 
 ### Delete a Variant’s Prices
 
-You can delete all the prices of a variant using the [Delete Variant Prices](https://docs.medusajs.com/api/admin#price-lists_deletepricelistspricelistvariantsvariantprices) endpoint:
+You can delete all the prices of a variant using the [Delete Variant Prices API Route](https://docs.medusajs.com/api/admin#price-lists_deletepricelistspricelistvariantsvariantprices):
 
 <Tabs groupId="request-type" isCodeTabs={true}>
 <TabItem value="client" label="Medusa JS Client" default>
@@ -639,7 +639,7 @@ This request returns the IDs of the deleted prices.
 
 ## Delete Price List
 
-You can delete a price list, and subsequently all prices defined in it, using the [Delete Price List](https://docs.medusajs.com/api/admin#price-lists_deletepricelistspricelist) endpoint:
+You can delete a price list, and subsequently all prices defined in it, using the [Delete Price List API Route](https://docs.medusajs.com/api/admin#price-lists_deletepricelistspricelist):
 
 <Tabs groupId="request-type" isCodeTabs={true}>
 <TabItem value="client" label="Medusa JS Client" default>

www/apps/docs/content/modules/price-lists/backend/override-price-selection-strategy.md

@@ -125,4 +125,4 @@ Run your backend to test it out:
 npx medusa develop
 ```
 
-Then, try out your strategy using any of the [Products](https://docs.medusajs.com/api/store#products) or [Carts](https://docs.medusajs.com/api/store#carts) endpoints which include retrieving product variants and line items respectively. You should then see the prices in the response based on your implemented strategy.
+Then, try out your strategy using any of the [Products](https://docs.medusajs.com/api/store#products) or [Carts](https://docs.medusajs.com/api/store#carts) API Routes which include retrieving product variants and line items respectively. You should then see the prices in the response based on your implemented strategy.

www/apps/docs/content/modules/price-lists/price-lists.md

@@ -61,7 +61,7 @@ The original price depends on the selected region or currency code in the curren
 
 The calculated price is the lowest price among all retrieved prices. Retrieved prices can include the original price and the price lists that can be applied. Prices are retrieved based on the [context](./price-selection-strategy.md#context-object).
 
-In the [Get Product](https://docs.medusajs.com/api/store#products_getproductsproduct) and [List Product](https://docs.medusajs.com/api/store#products_getproducts) endpoints, you must pass either the `region_id` or `currency_code` to retrieve the correct prices, as they are part of the price selection strategy context.
+In the [Get Product](https://docs.medusajs.com/api/store#products_getproductsproduct) and [List Product](https://docs.medusajs.com/api/store#products_getproducts) API Routes, you must pass either the `region_id` or `currency_code` to retrieve the correct prices, as they are part of the price selection strategy context.
 
 Each variant in the response has the following properties:
 
@@ -76,7 +76,7 @@ The total of a line item depends on the price of a product variant. When the lin
 
 Then, the `unit_price` of the line item is set to the `calculated_price` property of the product variant.
 
-When creating, retrieving, or updating the line item using the API endpoints, the line item’s totals are calculated. The following properties are returned as part of the endpoints’ responses:
+When creating, retrieving, or updating the line item using the API Routes, the line item’s totals are calculated. The following properties are returned as part of the API Routes' responses:
 
 - `unit_price`: The product variant’s calculated price.
 - `subtotal`: The `unit_price` multiplied by the quantity of the line item.