gateway: skip init meta bucket when meta is read only

[zhijian-pro]

1. Resolve a compatibility issue where the 1.2 version of gateway could not create a configuration file directory in the case of meta-readonly.
2. Fixed the bug that deleting an object through a web page does not report an error when using meta read-only.

close #4975
close #4989
close #4988

[codecov]

Codecov Report

Attention: Patch coverage is 15.00000% with 17 lines in your changes missing coverage. Please review.

Project coverage is 54.58%. Comparing base (a8cb0fc) to head (61a3a4e).
Report is 25 commits behind head on main.

Files	Patch %	Lines
pkg/gateway/gateway.go	15.38%	6 Missing and 5 partials ⚠️
cmd/gateway.go	14.28%	3 Missing and 3 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #4992       +/-   ##
===========================================
+ Coverage   24.97%   54.58%   +29.60%     
===========================================
  Files          25      161      +136     
  Lines       16045    43570    +27525     
===========================================
+ Hits         4007    23782    +19775     
- Misses      11549    17095     +5546     
- Partials      489     2693     +2204     

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[jiefenghuang]

LGTM