fix(lint): fix all linting errors

- Check BindEnv return values in config.go
- Add bounds checks for int->int32/uint32 conversions to prevent overflow
- Remove unused test helper functions

internal/client/grpc/audit_client.go

@@ -4,6 +4,7 @@ package grpc
 import (
 	"context"
 	"fmt"
+	"math"
 
 	auditv1 "git.dcentral.systems/toolz/goplt/api/proto/generated/audit/v1"
 	"git.dcentral.systems/toolz/goplt/pkg/registry"
@@ -86,9 +87,17 @@ func (c *AuditClient) Query(ctx context.Context, filters *services.AuditLogFilte
 		return nil, err
 	}
 
+	limit := filters.Limit
+	if limit > math.MaxInt32 {
+		limit = math.MaxInt32
+	}
+	offset := filters.Offset
+	if offset > math.MaxInt32 {
+		offset = math.MaxInt32
+	}
 	req := &auditv1.QueryRequest{
-		Limit:  int32(filters.Limit),
-		Offset: int32(filters.Offset),
+		Limit:  int32(limit),
+		Offset: int32(offset),
 	}
 
 	if filters.UserID != nil {

internal/config/config.go

@@ -100,9 +100,15 @@ func LoadConfig(env string) (config.ConfigProvider, error) {
 	// e.g., DATABASE_DSN -> database.dsn, SERVER_PORT -> server.port
 	v.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
 	// Bind specific environment variables to config keys
-	v.BindEnv("database.dsn", "DATABASE_DSN")
-	v.BindEnv("registry.consul.address", "REGISTRY_CONSUL_ADDRESS")
-	v.BindEnv("registry.type", "REGISTRY_TYPE")
+	if err := v.BindEnv("database.dsn", "DATABASE_DSN"); err != nil {
+		return nil, fmt.Errorf("failed to bind DATABASE_DSN: %w", err)
+	}
+	if err := v.BindEnv("registry.consul.address", "REGISTRY_CONSUL_ADDRESS"); err != nil {
+		return nil, fmt.Errorf("failed to bind REGISTRY_CONSUL_ADDRESS: %w", err)
+	}
+	if err := v.BindEnv("registry.type", "REGISTRY_TYPE"); err != nil {
+		return nil, fmt.Errorf("failed to bind REGISTRY_TYPE: %w", err)
+	}
 
 	return NewViperConfig(v), nil
 }