docs: Update server documentation to reflect renaming of server.py to app.py and modify setup instructions for PDM

docs/01_mcp_server.md

@@ -25,9 +25,9 @@ The server is implemented in Python, a language well-suited for web development
 ### d. TextBlob (for the Example Tool)
 [TextBlob](https://textblob.readthedocs.io/) is a Python library for text processing. We use it here to implement our example `sentiment_analysis` function. While TextBlob provides the logic for the tool, the focus is on how Gradio exposes *any such function* as an MCP tool.
 
-## 3. Server Implementation (`server.py`)
+## 3. Server Implementation (`app.py`)
 
-The `server.py` script contains all the logic for our server.
+The `app.py` script contains all the logic for our server.
 
 ```python
 import gradio as gr
@@ -84,9 +84,16 @@ if __name__ == "__main__":
 ## 4. Running the Server
 
 To start the server:
-1.  Ensure Python, Gradio, and TextBlob are installed in your environment (e.g., `pip install gradio textblob`).
-2.  Save the code above as `server.py`.
-3.  Run the script from your terminal: `python server.py`
+1.  Ensure you have [PDM](https://pdm.fming.dev/) installed in your environment.
+2.  Add the required dependencies using PDM:
+    ```bash
+    pdm add gradio textblob
+    ```
+3.  Save the code above as `app.py`.
+4.  Run the script using PDM:
+    ```bash
+    pdm run python app.py
+    ```
 
 You should see output indicating:
 *   The local URL for the web interface (e.g., `http://127.0.0.1:7860`).