chore: fix CI branch name and tidy go modules

- Update .github/workflows/ci.yml: main → master
- Run go mod tidy to clean up dependencies
- clickhouse-go/v2 moved to direct dependencies (used in code)
- Add test dependencies (stretchr/testify, kr/pretty)

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

go.mod

@@ -2,11 +2,13 @@ module github.com/logcorrelator/logcorrelator
 
 go 1.21
 
-require gopkg.in/yaml.v3 v3.0.1
+require (
+	github.com/ClickHouse/clickhouse-go/v2 v2.23.0
+	gopkg.in/yaml.v3 v3.0.1
+)
 
 require (
 	github.com/ClickHouse/ch-go v0.61.5 // indirect
-	github.com/ClickHouse/clickhouse-go/v2 v2.23.0 // indirect
 	github.com/andybalholm/brotli v1.1.0 // indirect
 	github.com/go-faster/city v1.0.1 // indirect
 	github.com/go-faster/errors v0.7.1 // indirect