feat(infra/llm): Gemini client with stream + count_tokens via google.golang.org/genai

go.sum

@@ -1,3 +1,9 @@
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@@ -71,8 +77,16 @@ github.com/golang-migrate/migrate/v4 v4.19.1/go.mod h1:CTcgfjxhaUtsLipnLoQRWCrjY
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@@ -220,6 +234,8 @@ golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v
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@@ -259,6 +275,15 @@ golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc
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