refactor: standardize constant naming and improve file-based auth handling

- Renamed constants from uppercase to CamelCase for consistency.
- Replaced redundant file-based auth handling logic with the new `util.CountAuthFiles` helper.
- Fixed various error-handling inconsistencies and enhanced robustness in file operations.
- Streamlined auth client reload logic in server and watcher components.
- Applied minor code readability improvements across multiple packages.

internal/util/translator.go

@@ -289,9 +289,6 @@ func sanitizeTypeFields(jsonStr string) string {
 						break
 					} else if typeStr == "number" || typeStr == "integer" {
 						preferredType = typeStr
-						if preferredType == "" {
-							preferredType = typeStr
-						}
 					} else if preferredType == "" {
 						preferredType = typeStr
 					}
@@ -323,6 +320,8 @@ func walkForTypeFields(value gjson.Result, path string, paths *[]string) {
 			walkForTypeFields(val, childPath, paths)
 			return true
 		})
+	default:
+
 	}
 }
 
@@ -367,5 +366,7 @@ func findNestedSchemaPaths(value gjson.Result, path string, fieldsToFind []strin
 			findNestedSchemaPaths(val, childPath, fieldsToFind, paths)
 			return true
 		})
+	default:
+
 	}
 }

internal/util/util.go

@@ -1,6 +1,11 @@
 package util
 
 import (
+	"io/fs"
+	"os"
+	"path/filepath"
+	"strings"
+
 	"github.com/router-for-me/CLIProxyAPI/v6/internal/config"
 	log "github.com/sirupsen/logrus"
 )
@@ -21,3 +26,38 @@ func SetLogLevel(cfg *config.Config) {
 		log.Infof("log level changed from %s to %s (debug=%t)", currentLevel, newLevel, cfg.Debug)
 	}
 }
+
+// CountAuthFiles returns the number of JSON auth files located under the provided directory.
+// The function resolves leading tildes to the user's home directory and performs a case-insensitive
+// match on the ".json" suffix so that files saved with uppercase extensions are also counted.
+func CountAuthFiles(authDir string) int {
+	if authDir == "" {
+		return 0
+	}
+	if strings.HasPrefix(authDir, "~") {
+		home, err := os.UserHomeDir()
+		if err != nil {
+			log.Debugf("countAuthFiles: failed to resolve home directory: %v", err)
+			return 0
+		}
+		authDir = filepath.Join(home, authDir[1:])
+	}
+	count := 0
+	walkErr := filepath.WalkDir(authDir, func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			log.Debugf("countAuthFiles: error accessing %s: %v", path, err)
+			return nil
+		}
+		if d.IsDir() {
+			return nil
+		}
+		if strings.HasSuffix(strings.ToLower(d.Name()), ".json") {
+			count++
+		}
+		return nil
+	})
+	if walkErr != nil {
+		log.Debugf("countAuthFiles: walk error: %v", walkErr)
+	}
+	return count
+}