Fix esbuild bundling errors caused by @mapbox/node-pre-gyp optional requires

[Copilot]

When bundling apps that use nodejieba with esbuild, the bundler statically analyzes @mapbox/node-pre-gyp's dependency tree and fails on optional/conditional require() calls in s3_setup.js for mock-aws-s3, aws-sdk, nock, and an unbundleable .html file.

Changes

• index.js: Replace the runtime require('@mapbox/node-pre-gyp') + binary.find() with a direct path computation derived from the static module_path/module_name values in package.json.

// Before
var binary = require('@mapbox/node-pre-gyp');
var path = require('path');
var binding_path = binary.find(path.resolve(path.join(__dirname,'./package.json')));
var nodejieba = require(binding_path);

// After
var path = require('path');
var BINARY_PATH = path.join(__dirname, 'build/Release/nodejieba.node');
var nodejieba = require(BINARY_PATH);

@mapbox/node-pre-gyp remains in dependencies — it's still invoked via npx in the install lifecycle script to download/build the native binary. Removing the runtime require() is sufficient to prevent esbuild from traversing its dependency tree.

Original prompt

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This section details on the original issue you should resolve

<issue_title>编译报错，找不到外部依赖包</issue_title>
<issue_description>✘ [ERROR] Could not resolve "mock-aws-s3"

node_modules/@mapbox/node-pre-gyp/lib/util/s3_setup.js:43:28:
  43 │     const AWSMock = require('mock-aws-s3');
     ╵                             ~~~~~~~~~~~~~

You can mark the path "mock-aws-s3" as external to exclude it from the bundle, which will remove
this error and leave the unresolved path in the bundle. You can also surround this "require" call
with a try/catch block to handle this failure at run-time instead of bundle-time.

✘ [ERROR] Could not resolve "aws-sdk"

node_modules/@mapbox/node-pre-gyp/lib/util/s3_setup.js:76:22:
  76 │   const AWS = require('aws-sdk');
     ╵                       ~~~~~~~~~

You can mark the path "aws-sdk" as external to exclude it from the bundle, which will remove this
error and leave the unresolved path in the bundle. You can also surround this "require" call with
a try/catch block to handle this failure at run-time instead of bundle-time.

✘ [ERROR] Could not resolve "nock"

node_modules/@mapbox/node-pre-gyp/lib/util/s3_setup.js:112:23:
  112 │   const nock = require('nock');
      ╵                        ~~~~~~

You can mark the path "nock" as external to exclude it from the bundle, which will remove this
error and leave the unresolved path in the bundle. You can also surround this "require" call with
a try/catch block to handle this failure at run-time instead of bundle-time.

✘ [ERROR] No loader is configured for ".html" files: node_modules/@mapbox/node-pre-gyp/lib/util/nw-pre-gyp/index.html

node_modules/@mapbox/node-pre-gyp/lib/node-pre-gyp.js:86:21:
  86 │       return require('./' + command)(self, argvx, callback)</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes 编译报错，找不到外部依赖包 #254

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