perf: notify nodes concurrently on register

[rfyiamcool]

summary

notify client info to nodes concurrently on register.

1. remove unused hubServer object.
2. format some code
3. format import package
4. err lint.

[sweep-ai]

Apply Sweep Rules to your PR?

• Apply: Leftover TODOs in the code should be handled.
• Apply: All new business logic should have corresponding unit tests in the tests/ directory.
• Apply: Any clearly inefficient or repeated code should be optimized or refactored.

[codecov]

Codecov Report

Merging #1327 (a630f42) into main (2496a16) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

@@           Coverage Diff            @@
##            main   #1327      +/-   ##
========================================
- Coverage   4.30%   4.29%   -0.02%     
========================================
  Files         45      45              
  Lines       3809    3819      +10     
========================================
  Hits         164     164              
- Misses      3634    3644      +10     
  Partials      11      11              

Files	Coverage Δ
internal/msggateway/n_ws_server.go	0.00% <0.00%> (ø)

[cubxxw]

@rfyiamcool I kindly request your assistance in resolving a conflict.

[pull-request-size]

Whoa! Easy there, Partner!

This PR is too big. Please break it up into smaller PRs.