Add Groq AI provider support

- Add groq-sdk dependency to backend
- Add groq_api_key and groq_model columns to users table
- Implement extractWithGroq, verifyWithGroq, verifyStockStatusWithGroq, arbitrateWithGroq functions
- Add Groq settings to backend routes with test endpoint
- Add Groq provider option to frontend Settings UI with model selection
- Support for llama-3.3-70b-versatile, llama-3.1-8b-instant, mixtral-8x7b-32768, gemma2-9b-it models

Resolves: #26

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

backend/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "priceghost-backend",
-  "version": "1.0.5",
+  "version": "1.0.6",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "priceghost-backend",
-      "version": "1.0.5",
+      "version": "1.0.6",
       "dependencies": {
         "@anthropic-ai/sdk": "^0.24.0",
         "@google/generative-ai": "^0.24.1",
@@ -16,6 +16,7 @@
         "cors": "^2.8.5",
         "dotenv": "^16.3.1",
         "express": "^4.18.2",
+        "groq-sdk": "^0.5.0",
         "jsonwebtoken": "^9.0.2",
         "node-cron": "^3.0.3",
         "openai": "^4.47.0",
@@ -2425,6 +2426,37 @@
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       "license": "ISC"
     },
+    "node_modules/groq-sdk": {
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+      "resolved": "https://registry.npmjs.org/groq-sdk/-/groq-sdk-0.5.0.tgz",
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+      "license": "Apache-2.0",
+      "dependencies": {
+        "@types/node": "^18.11.18",
+        "@types/node-fetch": "^2.6.4",
+        "abort-controller": "^3.0.0",
+        "agentkeepalive": "^4.2.1",
+        "form-data-encoder": "1.7.2",
+        "formdata-node": "^4.3.2",
+        "node-fetch": "^2.6.7",
+        "web-streams-polyfill": "^3.2.1"
+      }
+    },
+    "node_modules/groq-sdk/node_modules/@types/node": {
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+      "license": "MIT",
+      "dependencies": {
+        "undici-types": "~5.26.4"
+      }
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+    "node_modules/groq-sdk/node_modules/undici-types": {
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