docs: update STACKIT provider documentation with typo fix (#13357)

Co-authored-by: amankalra172 <aman.kalra@st.ovgu.de>

packages/web/src/content/docs/providers.mdx

@@ -1478,6 +1478,38 @@ SAP AI Core provides access to 40+ models from OpenAI, Anthropic, Google, Amazon
 
 ---
 
+### STACKIT
+
+STACKIT AI Model Serving provides fully managed soverign hosting environment for AI models, focusing on LLMs like Llama, Mistral, and Qwen, with maximum data sovereignty on European infrastructure.
+
+1. Head over to [STACKIT Portal](https://portal.stackit.cloud), navigate to **AI Model Serving**, and create an auth token for your project.
+
+   :::tip
+   You need a STACKIT customer account, user account, and project before creating auth tokens.
+   :::
+
+2. Run the `/connect` command and search for **STACKIT**.
+
+   ```txt
+   /connect
+   ```
+
+3. Enter your STACKIT AI Model Serving auth token.
+
+   ```txt
+   ┌ API key
+   │
+   │
+   └ enter
+   ```
+
+4. Run the `/models` command to select from available models like _Qwen3-VL 235B_ or _Llama 3.3 70B_.
+
+   ```txt
+   /models
+   ```
+---
+
 ### OVHcloud AI Endpoints
 
 1. Head over to the [OVHcloud panel](https://ovh.com/manager). Navigate to the `Public Cloud` section, `AI & Machine Learning` > `AI Endpoints` and in `API Keys` tab, click **Create a new API key**.