refactor(proxy): migrate to zerolog structured logging

internal/proxy/sniff.go

@@ -3,13 +3,14 @@ package proxy
 import (
 	"fmt"
 	"io"
-	"log"
 	"net"
 	"net/http"
 	"os/exec"
 	"strings"
 	"sync"
 	"time"
+
+	"github.com/rs/zerolog/log"
 )
 
 // SniffedProfile holds everything captured from a real Claude Code request.
@@ -116,8 +117,11 @@ func SniffClaudeCode(claudeBinary string) (*SniffedProfile, error) {
 		return nil, fmt.Errorf("no API request captured")
 	}
 
-	log.Printf("sniffed claude-code: version=%s headers=%d body=%d bytes",
-		profile.Version, len(profile.Headers), len(profile.Body))
+	log.Info().
+		Str("version", profile.Version).
+		Int("headers", len(profile.Headers)).
+		Int("body_size", len(profile.Body)).
+		Msg("sniffed claude-code profile")
 	return profile, nil
 }