feat: Integrate Amazon SP-API for product sellability and pricing

- Added `amazon-sp-api` dependency to package.json.
- Enhanced configuration to include SP-API credentials and settings.
- Implemented SP-API client initialization and error handling in sp-api.ts.
- Developed functions to fetch product sellability and pricing data.
- Updated main processing logic in index.ts to incorporate sellability checks before fetching pricing.
- Modified LLM analysis to account for sellability status and reasons.
- Created a new sp-test.ts script for testing SP-API connectivity and sellability.
- Updated types.ts to define SellabilityInfo and extend SpApiData.
- Enhanced result reporting in writer.ts to include sellability information.

bun.lock

@@ -5,6 +5,7 @@
     "": {
       "name": "asin-check",
       "dependencies": {
+        "amazon-sp-api": "^1.2.1",
         "ioredis": "^5.10.1",
         "xlsx": "^0.18.5",
       },
@@ -25,8 +26,14 @@
 
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+
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+
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@@ -35,28 +42,78 @@
 
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