feat(ai-proxy): add client token; add rate-limit filter

[sfwn]

What this PR does / why we need it:

• add client-token
• remove useless configs
• add rate-limit filter

Specified Reviewers:

/assign @your-reviewer

ChangeLog

Language	Changelog
🇺🇸 English	add client token
🇨🇳 中文	增加 client token

[codecov]

Codecov Report

Merging #6045 (56b56ed) into master (852a5e3) will increase coverage by 0.30%.
Report is 11 commits behind head on master.
The diff coverage is 46.07%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6045      +/-   ##
==========================================
+ Coverage   22.48%   22.79%   +0.30%     
==========================================
  Files        1888     1767     -121     
  Lines      209748   190738   -19010     
==========================================
- Hits        47170    43477    -3693     
+ Misses     157232   142272   -14960     
+ Partials     5346     4989     -357     

Files Changed	Coverage Δ
...ocol/standard-components/issueFilter/conditions.go	6.71% <0.00%> (-0.19%)	⬇️
...otocol/standard-components/issueFilter/provider.go	13.33% <0.00%> (-0.28%)	⬇️
...viders/issue/core/query/issueexcel/model_sample.go	0.00% <0.00%> (ø)
...nal/apps/dop/providers/project_report/calculate.go	6.34% <0.00%> (+0.02%)	⬆️
...nternal/apps/dop/providers/project_report/query.go	17.60% <0.00%> (-0.44%)	⬇️
...al/pkg/ai-functions/handler/handler_ai_function.go	0.00% <0.00%> (ø)
internal/pkg/ai-functions/sdk/client.go	0.00% <0.00%> (ø)
pkg/http/httputil/header.go	94.44% <ø> (ø)
...l/pkg/ai-functions/functions/test-case/function.go	45.58% <58.00%> (ø)
...ons/handler/handler_ai_function_create_testcase.go	64.04% <64.04%> (ø)
... and 1 more

... and 128 files with indirect coverage changes