docs: remove inline imports from API reference examples (#1958)

* docs: add missing imports to API reference examples

Add Chain and OrderSide imports to getNFT, pagination, and error
handling examples to make them copy-paste ready.

Co-Authored-By: Damian <236994396+ev0r0x@users.noreply.github.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* docs: remove inline imports from API reference examples

Snippets are code fragments, not standalone files — readers already
import from opensea-js during setup. Removing imports keeps every
example consistent and avoids churn from "missing import" fixes.

Co-Authored-By: Damian <236994396+ev0r0x@users.noreply.github.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Damian <236994396+ev0r0x@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: 3 people

developerDocs/api-reference.md

@@ -227,8 +227,6 @@ console.log(collection.fees);
 Fetch a list of collections with filtering and sorting options.
 
 ```typescript
-import { CollectionOrderByOption, Chain } from "opensea-js";
-
 const { collections, next } = await openseaSDK.api.getCollections(
   CollectionOrderByOption.SEVEN_DAY_VOLUME, // Sort by 7-day volume
   Chain.Mainnet, // Filter by chain
@@ -929,8 +927,6 @@ Events include sales, transfers, listings, offers, and cancellations.
 Fetch all events with optional filtering.
 
 ```typescript
-import { AssetEventType } from "opensea-js";
-
 const { asset_events, next } = await openseaSDK.api.getEvents({
   event_type: AssetEventType.SALE,
   limit: 50,
@@ -1038,8 +1034,6 @@ asset_events.forEach((event) => {
 Fetch events for a specific NFT.
 
 ```typescript
-import { Chain } from "opensea-js";
-
 const { asset_events } = await openseaSDK.api.getEventsByNFT(
   Chain.Mainnet,
   "0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D",
@@ -1244,8 +1238,6 @@ console.log(`${token.name} (${token.symbol})`);
 Search across collections, tokens, NFTs, and accounts. Results are ranked by relevance.
 
 ```typescript
-import { SearchResponse } from "opensea-js";
-
 const results = await openseaSDK.api.search({
   query: "bored ape",
   chains: ["ethereum"], // Optional: filter by chain