add signup utm source

Signed-off-by: ChengZi <chen.zhang@zilliz.com>

Author: zc277584121

README.md

@@ -26,7 +26,7 @@ Model Context Protocol (MCP) allows you to integrate Code Context with your favo
 <details>
 <summary><strong>Get a free vector database on Zilliz Cloud</strong></summary>
 
-Code Context needs a vector database. You can [sign up](https://cloud.zilliz.com/signup) on Zilliz Cloud to get a free Serverless cluster.
+Code Context needs a vector database. You can [sign up](https://cloud.zilliz.com/signup?utm_source=github&utm_medium=referral&utm_campaign=2507-codecontext-readme) on Zilliz Cloud to get a free Serverless cluster.
 
 ![](assets/signup_and_create_cluster.jpeg)
 

packages/core/README.md

@@ -23,7 +23,7 @@ OPENAI_API_KEY=your-openai-api-key
 #### Zilliz Cloud configuration
 Get a free Milvus vector database on Zilliz Cloud. 
 
-Code Context needs a vector database. You can [sign up](https://cloud.zilliz.com/signup) on Zilliz Cloud to get a free Serverless cluster.
+Code Context needs a vector database. You can [sign up](https://cloud.zilliz.com/signup?utm_source=github&utm_medium=referral&utm_campaign=2507-codecontext-readme) on Zilliz Cloud to get a free Serverless cluster.
 
 ![](../../assets/signup_and_create_cluster.jpeg)
 

packages/mcp/README.md

@@ -149,7 +149,7 @@ OLLAMA_HOST=http://127.0.0.1:11434
 #### Zilliz Cloud configuration
 Get a free Milvus vector database on Zilliz Cloud. 
 
-Code Context needs a vector database. You can [sign up](https://cloud.zilliz.com/signup) on Zilliz Cloud to get a free Serverless cluster.
+Code Context needs a vector database. You can [sign up](https://cloud.zilliz.com/signup?utm_source=github&utm_medium=referral&utm_campaign=2507-codecontext-readme) on Zilliz Cloud to get a free Serverless cluster.
 
 ![](../../assets/signup_and_create_cluster.jpeg)
 

packages/vscode-extension/README.md

@@ -65,7 +65,7 @@ Configure how your code is split into chunks for indexing.
 #### Zilliz Cloud configuration
 Get a free Milvus vector database on Zilliz Cloud. 
 
-Code Context needs a vector database. You can [sign up](https://cloud.zilliz.com/signup) on Zilliz Cloud to get a free Serverless cluster.
+Code Context needs a vector database. You can [sign up](https://cloud.zilliz.com/signup?utm_source=github&utm_medium=referral&utm_campaign=2507-codecontext-readme) on Zilliz Cloud to get a free Serverless cluster.
 
 ![](https://raw.githubusercontent.com/zilliztech/code-context/master/assets/signup_and_create_cluster.jpeg)