fix: [restful]use default search parameter nq: 0

[PowderLi]

issue: #32225
master pr: #32355

1. v1 can only accept one vector, but v2 accept list of vectors
2. cannot get dbName from AliasReq [Bug]: [restful v2]The dbName parameter of the describe alias interface did not take effect #31978

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.60%. Comparing base (82cf91f) to head (72c30ae).
Report is 2 commits behind head on 2.4.

Additional details and impacted files

@@           Coverage Diff           @@
##              2.4   #32356   +/-   ##
=======================================
  Coverage   81.60%   81.60%           
=======================================
  Files         976      976           
  Lines      120017   120017           
=======================================
+ Hits        97940    97943    +3     
+ Misses      18353    18340   -13     
- Partials     3724     3734   +10     

Files	Coverage Δ
...nternal/distributed/proxy/httpserver/handler_v2.go	89.39% <100.00%> (ø)
...nternal/distributed/proxy/httpserver/request_v2.go	100.00% <100.00%> (ø)

... and 23 files with indirect coverage changes

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[PowderLi]

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[czs007]

/approve
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: czs007, PowderLi

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