[feat][prompt] add prompt_key for GetPromptOApi

[lizwang11]

GetPromptOApi : Add prompt_key query parameter to GetPromptOApiRequest . When prompt_id is 0 and prompt_key is provided, resolve prompt_id by calling GetPromptMetaByKey RPC before proceeding with the original flow. The gray check ( isPromptV2Gray ) is evaluated first.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff             @@
##             main     #501      +/-   ##
==========================================
+ Coverage   76.99%   77.06%   +0.06%     
==========================================
  Files         647      649       +2     
  Lines       71513    72033     +520     
==========================================
+ Hits        55063    55511     +448     
- Misses      13142    13201      +59     
- Partials     3308     3321      +13     

Flag	Coverage Δ
unittests	77.06% <ø> (+0.06%)	⬆️

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see 23 files with indirect coverage changes

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