feat(demos): add xiaomi mimo integration demo

demos/integrations/xiaomi_mimo/README.md

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+# Xiaomi MiMo via Plano
+
+This demo configures Plano to call Xiaomi MiMo as a standard LLM upstream using the OpenAI-compatible API surface.
+
+## Prerequisites
+
+1. Ensure the [prerequisites](https://github.com/katanemo/arch/?tab=readme-ov-file#prerequisites) are installed correctly.
+2. Export your MiMo API key:
+
+```sh
+export MIMO_API_KEY=your_mimo_api_key
+```
+
+## Start the demo
+
+```sh
+sh run_demo.sh
+```
+
+Plano will start a model listener on `http://localhost:12000`.
+
+## First API call through Plano
+
+```sh
+curl --location --request POST 'http://localhost:12000/v1/chat/completions' \
+  --header "Content-Type: application/json" \
+  --data-raw '{
+    "model": "mimo-v2-pro",
+    "messages": [
+      {
+        "role": "system",
+        "content": "You are MiMo, an AI assistant developed by Xiaomi. Today is Tuesday, December 16, 2025. Your knowledge cutoff date is December 2024."
+      },
+      {
+        "role": "user",
+        "content": "please introduce yourself"
+      }
+    ],
+    "max_completion_tokens": 1024,
+    "temperature": 1.0,
+    "top_p": 0.95,
+    "stream": false
+  }'
+```
+
+## Optional: OpenAI Python SDK against Plano
+
+```python
+from openai import OpenAI
+
+client = OpenAI(
+    api_key="unused-when-calling-plano",
+    base_url="http://localhost:12000/v1",
+)
+
+resp = client.chat.completions.create(
+    model="mimo-v2-pro",
+    messages=[{"role": "user", "content": "please introduce yourself"}],
+)
+
+print(resp.model_dump_json(indent=2))
+```
+
+## Stop the demo
+
+```sh
+sh run_demo.sh down
+```