docs: optimize README and remove package-lock.json from version control

- Simplified README.md to align with Python SDK format
  - Removed redundant API Reference section
  - Simplified environment variables table (only WAVESPEED_API_KEY)
  - Unified code examples to use async/await style
  - Reduced file size by 28% (from 192 to 138 lines)

- Added package-lock.json to .gitignore
  - Library projects should not commit lock files
  - Prevents dependency conflicts for library users
  - Local file is preserved for development consistency

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: Leeon-Tang

.gitignore

@@ -1,5 +1,6 @@
 # Dependencies
 node_modules/
+package-lock.json
 npm-debug.log*
 yarn-debug.log*
 yarn-error.log*

README.md

@@ -33,11 +33,11 @@ const WaveSpeed = require('wavespeed');
 
 const client = new WaveSpeed('your-api-key');
 
-client.run('wavespeed-ai/z-image/turbo', { prompt: 'Cat' })
-  .then(prediction => {
-    console.log(prediction.outputs[0]); // Output URL
-  })
-  .catch(console.error);
+const prediction = await client.run('wavespeed-ai/z-image/turbo', {
+  prompt: 'Cat'
+});
+
+console.log(prediction.outputs[0]);  // Output URL
 ```
 
 Or with TypeScript:
@@ -51,7 +51,7 @@ const prediction = await client.run('wavespeed-ai/z-image/turbo', {
   prompt: 'Cat'
 });
 
-console.log(prediction.outputs[0]); // Output URL
+console.log(prediction.outputs[0]);  // Output URL
 ```
 
 ### Authentication
@@ -65,24 +65,24 @@ export WAVESPEED_API_KEY="your-api-key"
 Or pass it directly:
 
 ```javascript
+const WaveSpeed = require('wavespeed');
+
 const client = new WaveSpeed('your-api-key');
+const prediction = await client.run('wavespeed-ai/z-image/turbo', { prompt: 'Cat' });
 ```
 
 ### Options
 
 ```javascript
-const client = new WaveSpeed('your-api-key', {
-  timeout: 36000,      // Max wait time in seconds (default: 36000)
-  pollInterval: 1,     // Status check interval (default: 1)
-});
-
-const prediction = await client.run('wavespeed-ai/z-image/turbo', {
-  prompt: 'Cat'
-}, {
-  timeout: 300,        // Override timeout for this request
-  pollInterval: 2,     // Override poll interval for this request
-  enableSyncMode: false, // Single request mode, no polling (default: false)
-});
+const prediction = await client.run(
+  'wavespeed-ai/z-image/turbo',
+  { prompt: 'Cat' },
+  {
+    timeout: 36000,         // Max wait time in seconds (default: 36000)
+    pollInterval: 1,        // Status check interval (default: 1)
+    enableSyncMode: false,  // Single request mode, no polling (default: false)
+  }
+);
 ```
 
 ### Sync Mode
@@ -92,18 +92,20 @@ Use `enableSyncMode: true` for a single request that waits for the result (no po
 > **Note:** Not all models support sync mode. Check the model documentation for availability.
 
 ```javascript
-const prediction = await client.run('wavespeed-ai/z-image/turbo', {
-  prompt: 'Cat'
-}, {
-  enableSyncMode: true
-});
+const prediction = await client.run(
+  'wavespeed-ai/z-image/turbo',
+  { prompt: 'Cat' },
+  { enableSyncMode: true }
+);
 ```
 
 ### Retry Configuration
 
 Configure retries at the client level:
 
 ```javascript
+const WaveSpeed = require('wavespeed');
+
 const client = new WaveSpeed('your-api-key', {
   maxRetries: 0,            // Task-level retries (default: 0)
   maxConnectionRetries: 3,  // HTTP connection retries (default: 3)
@@ -116,63 +118,10 @@ const client = new WaveSpeed('your-api-key', {
 Upload images, videos, or audio files:
 
 ```javascript
-client.upload('/path/to/image.png')
-  .then(url => console.log(url))
-  .catch(console.error);
-```
-
-## API Reference
-
-### WaveSpeed Client
-
-```typescript
-new WaveSpeed(apiKey?: string, options?: {
-  baseUrl?: string,
-  pollInterval?: number,
-  timeout?: number
-})
-```
-
-#### Parameters:
-- `apiKey` (string): Your WaveSpeed API key
-- `options` (object, optional):
-  - `baseUrl` (string): API base URL without path (default: `https://api.wavespeed.ai`)
-  - `pollInterval` (number): Poll interval in seconds (default: 1)
-  - `timeout` (number): Overall wait timeout in seconds (default: 36000)
-
-### Methods
-
-#### run
-
-```typescript
-run(modelId: string, input: Record<string, any>, options?: { pollInterval?: number; timeout?: number }): Promise<Prediction>
-```
-
-Run a model and wait for completion.
-
-#### create
-
-```typescript
-create(modelId: string, input: Record<string, any>): Promise<Prediction>
-```
-
-Create a prediction without waiting for completion.
-
-#### upload
-
-```typescript
-upload(filePath: string): Promise<string>
-```
-
-Upload a file and get a download URL.
-
-### Prediction
+const WaveSpeed = require('wavespeed');
 
-```typescript
-prediction.id        // Unique prediction ID
-prediction.status    // Status: processing, completed, failed
-prediction.outputs   // Array of output URLs
-prediction.error     // Error message if failed
+const url = await client.upload('/path/to/image.png');
+console.log(url);
 ```
 
 ## Environment Variables
@@ -182,9 +131,6 @@ prediction.error     // Error message if failed
 | Variable | Description |
 |----------|-------------|
 | `WAVESPEED_API_KEY` | WaveSpeed API key |
-| `WAVESPEED_BASE_URL` | API base URL without path (default: `https://api.wavespeed.ai`) |
-| `WAVESPEED_POLL_INTERVAL` | Poll interval seconds for `run` (default: `1`) |
-| `WAVESPEED_TIMEOUT` | Overall wait timeout seconds for `run` (default: `36000`)
 
 ## License