添加 chat 接口

[yumosx]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 129 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.17%. Comparing base (c561469) to head (07a0515).
⚠️ Report is 2 commits behind head on dev.

Files with missing lines	Patch %	Lines
api/proto/gen/chat/v1/chat.pb.go	0.00%	47 Missing ⚠️
api/proto/gen/chat/v1/chat_grpc.pb.go	0.00%	26 Missing ⚠️
internal/service/chat.go	0.00%	23 Missing ⚠️
internal/service/llm/openai/handler.go	0.00%	23 Missing ⚠️
internal/grpc/chat.go	0.00%	10 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             dev     #30      +/-   ##
========================================
- Coverage   0.17%   0.17%   -0.01%     
========================================
  Files         55      55              
  Lines       2848    2930      +82     
========================================
  Hits           5       5              
- Misses      2842    2924      +82     
  Partials       1       1              

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