feat(backend): Add telnet protocol support

backend/internal/connector/protocols/db/postgresql.go

@@ -0,0 +1,34 @@
+package db
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/veops/oneterm/internal/model"
+)
+
+// getPostgreSQLConfig returns PostgreSQL client configuration
+func getPostgreSQLConfig(ip string, port int, account *model.Account) DBClientConfig {
+	// Set PGPASSWORD environment variable instead of using -W
+	os.Setenv("PGPASSWORD", account.Password)
+
+	args := []string{
+		"-h", ip,
+		"-p", fmt.Sprintf("%d", port),
+		"-U", account.Account,
+		"postgres", // Default database name
+	}
+
+	// Add database name if specified in the account.Account field (username/database format)
+	parts := strings.Split(account.Account, "/")
+	if len(parts) > 1 {
+		args = append(args, "-d", parts[1])
+	}
+
+	return DBClientConfig{
+		Command:     "psql",
+		Args:        args,
+		ExitAliases: []string{"\\q", "exit", "quit"},
+	}
+}