feat: csharp add more test

[moyilong]

add test
fix i18n doc missing

[codecov]

Codecov Report

Merging #142 (5905b6a) into main (3eb9a89) will increase coverage by 6.90%.
The diff coverage is 70.87%.

@@             Coverage Diff              @@
##               main     #142      +/-   ##
============================================
+ Coverage     57.57%   64.48%   +6.90%     
  Complexity        2        2              
============================================
  Files            81       70      -11     
  Lines          2046     1971      -75     
  Branches        155      155              
============================================
+ Hits           1178     1271      +93     
+ Misses          824      645     -179     
- Partials         44       55      +11     

Files	Coverage Δ
...ages/csharp/Pleisto.Flappy.Test/CodeInterpreter.cs	100.00% <100.00%> (ø)
...Flappy.Test/Features/CodeInterpreterFeatureTest.cs	100.00% <100.00%> (ø)
...rp/Pleisto.Flappy.Test/Features/FeatureTestBase.cs	100.00% <100.00%> (ø)
...ges/csharp/Pleisto.Flappy.Test/LLM/BaichuanTest.cs	28.57% <ø> (ø)
...ages/csharp/Pleisto.Flappy.Test/LLM/ChatGPTTest.cs	27.27% <ø> (ø)
...harp/Pleisto.Flappy/CodeInterpreter/NativeInput.cs	100.00% <ø> (ø)
...arp/Pleisto.Flappy/CodeInterpreter/NativeResult.cs	100.00% <ø> (ø)
...ptions/InvalidJsonWithSchemaValidationException.cs	0.00% <ø> (ø)
...odeInterpreter/CodeInterpreterFeatureDefinition.cs	100.00% <100.00%> (+100.00%)	⬆️
...sharp/Pleisto.Flappy/Features/FlappyFeatureBase.cs	85.29% <100.00%> (ø)
... and 17 more

... and 14 files with indirect coverage changes

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