axios version 1.13.6 package.json "Cannot use import statement outside a module" in node 12

Issue Title

  axios 1.13.6 breaks CommonJS compatibility - "Cannot use import statement outside a module"

  Issue Description

  ### Description

  The axios 1.13.6 release introduces a breaking change in the `package.json` configuration that causes **"Cannot use import statement outside a module"** errors in CommonJS (Node.js) environments.

  ### Root Cause

  The issue is caused by a change in the `main` entry point configuration between versions:

  **axios 1.13.5 (Working):**
  - `main` field: `"./dist/node/axios.cjs"` (CommonJS compatible)
  - `type` field: `"module"`

  **axios 1.13.6 (Broken):**
  - `main` field: `"./index.js"` (ES Module format)
  - `type` field: `"module"`

  ### Impact

  When axios 1.13.6 is used as a dependency in a CommonJS project:
  1. The package is loaded via `require('axios')`
  2. Node.js resolves to the `main` entry point: `index.js`
  3. The `index.js` file uses ES Module syntax: `import axios from './lib/axios.js'`
  4. This causes the error: **"Cannot use import statement outside a module"**

  ### Reproduction

  This issue occurs when axios 1.13.6 is installed as a nested dependency in a CommonJS Node.js project.

  Example error stack:
  SyntaxError: Cannot use import statement outside a module
  /node_modules/@larksuiteoapi/node-sdk/node_modules/axios/index.js:1
  import axios from './lib/axios.js';
  ^^^^^^

  ### Expected Behavior

  The `main` field should point to a CommonJS-compatible entry point (like `./dist/node/axios.cjs`) to maintain backward compatibility with CommonJS environments.

  ### Suggested Fix

  One of the following:
  1. Revert the `main` field to `"./dist/node/axios.cjs"` (as in 1.13.5)
  2. Release this as a major version bump (2.0.0) since it's a breaking change
  3. Keep `./index.js` but ensure it exports a CommonJS-compatible format when loaded via `require()`

  ### Environment

  - Node.js version: 12.13.1 (CommonJS)
  - npm version: 6.x
  - axios version: 1.13.6

  ### Workaround

  Lock axios to version 1.13.5 using package manager overrides/resolutions.

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