fix(hubble): validate new FE/BE runtime and enable executable backend

[KavanaN12]

Purpose of the PR

• close [Task] New Grpah-UI(hubble) backend module issues #694

This PR validates and fixes the runtime integration between the new HugeGraph Hubble 2.0 frontend and backend modules.
It solves the issue where the backend could not run as an executable JAR and the frontend could not communicate with the backend API during development.
After this change, both modules run successfully and communicate end-to-end.

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Main Changes

Backend (hubble-be)

• Added spring-boot-maven-plugin to package the backend as a runnable Spring Boot JAR.
• Verified working startup using:

java -Dhubble.home.path=. -jar hugegraph-hubble/hubble-be/target/hubble-be-1.7.0.jar

• Confirmed backend reports correct status:

{"status":"UP"}

Frontend (hubble-fe)

• Configured development proxy in package.json:

"proxy": "http://localhost:8088"

• Verified frontend successfully reaches backend through /api/* requests.
• Confirmed:

GET /api/v1.2/graph-connections → 200 OK

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Verifying These Changes

• Backend successfully built using Maven
• Backend successfully started and reachable
• Frontend installed using Yarn
• Frontend started using Node 18 with OpenSSL legacy provider
• Confirmed frontend and backend communicate correctly
• Full end-to-end functionality tested

Screenshots included in this PR (backend health result + frontend DevTools network success).

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Does This PR Potentially Affect the Following?

• Nope
• Dependencies (add/update license info)
• Modify configurations
• The public API
• Other impacts (type here if needed)

---

Documentation Status

• Doc - TODO
• Doc - Done
• Doc - No Need
  (The change only improves runtime behavior and does not modify user-facing features.)

---

Additional Notes

This update removes setup blockers for contributors working with the Hubble 2.0 codebase and ensures the development workflow operates correctly using the updated architecture.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (b066b80) to head (cadbb23).
⚠️ Report is 67 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (b066b80) and HEAD (cadbb23). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (b066b80)	HEAD (cadbb23)
	2	1

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #701       +/-   ##
============================================
- Coverage     62.49%   0.00%   -62.50%     
============================================
  Files           262      34      -228     
  Lines          9541    3087     -6454     
  Branches        886     436      -450     
============================================
- Hits           5963       0     -5963     
+ Misses         3190    3087      -103     
+ Partials        388       0      -388     

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[github-actions]

Due to the lack of activity, the current pr is marked as stale and will be closed after 180 days, any update will remove the stale label

[github-actions]

Due to the lack of activity, the current pr is marked as stale and will be closed after 180 days, any update will remove the stale label