feat: add Jenkins service entry

NOTICE.md

@@ -11,11 +11,15 @@ official/open-source project assets:
 - `assets/icons/deepseek.svg`: DeepSeek icon from Wikimedia Commons
 - `assets/icons/gemini.svg`: Google Gemini public web asset
 - `assets/icons/git.svg`: Git logo from git-scm.com
+- `assets/icons/jenkins.svg`: Jenkins project artwork, CC BY-SA 3.0
 - `assets/icons/syncthing.svg`: Syncthing project logo
 - `assets/icons/frp.svg`: FRP icon from dashboard-icons
 
 The names and marks of these services belong to their respective owners.
 
+Jenkins artwork source:
+https://www.jenkins.io/artwork/
+
 ## Background Credit
 
 - `assets/backgrounds/cute-anime-bg.svg`: `Blue Haired Anime Girl With Star