[BUG] Cleanup tool descriptions to remove newlines and truncate text

[crivetimihai]

🐞 Bug Summary
Tool descriptions in the UI contain newline characters and are not truncated, leading to display and formatting inconsistencies.

---

🧩 Affected Component

Select the area of the project impacted:

• mcpgateway - API
• mcpgateway - UI (admin panel)
• mcpgateway.wrapper - stdio wrapper
• Federation or Transports
• CLI, Makefiles, or shell scripts
• Container setup (Docker/Podman/Compose)
• Other (explain below)

---

🔁 Steps to Reproduce

1. In the admin UI panel, navigate to the Global tools page.
2. In tool descriptions – observed line breaks (\n) and lack of truncation for long texts.

---

🤔 Expected Behavior
Tool descriptions should be cleaned to remove newline characters and truncated if they exceed a certain length, ensuring consistent formatting in the UI.