Add openai codex support

internal/config/config.go

@@ -6,26 +6,36 @@ package config
 
 import (
 	"fmt"
-	"gopkg.in/yaml.v3"
 	"os"
+
+	"gopkg.in/yaml.v3"
 )
 
 // Config represents the application's configuration, loaded from a YAML file.
 type Config struct {
 	// Port is the network port on which the API server will listen.
 	Port int `yaml:"port"`
+
 	// AuthDir is the directory where authentication token files are stored.
 	AuthDir string `yaml:"auth-dir"`
+
 	// Debug enables or disables debug-level logging and other debug features.
 	Debug bool `yaml:"debug"`
+
 	// ProxyURL is the URL of an optional proxy server to use for outbound requests.
 	ProxyURL string `yaml:"proxy-url"`
+
 	// APIKeys is a list of keys for authenticating clients to this proxy server.
 	APIKeys []string `yaml:"api-keys"`
+
 	// QuotaExceeded defines the behavior when a quota is exceeded.
 	QuotaExceeded QuotaExceeded `yaml:"quota-exceeded"`
+
 	// GlAPIKey is the API key for the generative language API.
 	GlAPIKey []string `yaml:"generative-language-api-key"`
+
+	// RequestLog enables or disables detailed request logging functionality.
+	RequestLog bool `yaml:"request-log"`
 }
 
 // QuotaExceeded defines the behavior when API quota limits are exceeded.
@@ -33,12 +43,21 @@ type Config struct {
 type QuotaExceeded struct {
 	// SwitchProject indicates whether to automatically switch to another project when a quota is exceeded.
 	SwitchProject bool `yaml:"switch-project"`
+
 	// SwitchPreviewModel indicates whether to automatically switch to a preview model when a quota is exceeded.
 	SwitchPreviewModel bool `yaml:"switch-preview-model"`
 }
 
 // LoadConfig reads a YAML configuration file from the given path,
-// unmarshals it into a Config struct, and returns it.
+// unmarshals it into a Config struct, applies environment variable overrides,
+// and returns it.
+//
+// Parameters:
+//   - configFile: The path to the YAML configuration file
+//
+// Returns:
+//   - *Config: The loaded configuration
+//   - error: An error if the configuration could not be loaded
 func LoadConfig(configFile string) (*Config, error) {
 	// Read the entire configuration file into memory.
 	data, err := os.ReadFile(configFile)