Add custom logo URL configuration option

Bug: https://github.com/happyDomain/happydeliver/issues/6

internal/config/cli.go

@@ -41,6 +41,7 @@ func declareFlags(o *Config) {
 	flag.DurationVar(&o.ReportRetention, "report-retention", o.ReportRetention, "How long to keep reports (e.g., 720h, 30d). 0 = keep forever")
 	flag.UintVar(&o.RateLimit, "rate-limit", o.RateLimit, "API rate limit (requests per second per IP)")
 	flag.Var(&URL{&o.SurveyURL}, "survey-url", "URL for user feedback survey")
+	flag.StringVar(&o.CustomLogoURL, "custom-logo-url", o.CustomLogoURL, "URL for custom logo image in the web UI")
 
 	// Others flags are declared in some other files likes sources, storages, ... when they need specials configurations
 }

internal/config/config.go

@@ -44,6 +44,7 @@ type Config struct {
 	ReportRetention time.Duration // How long to keep reports. 0 = keep forever
 	RateLimit       uint          // API rate limit (requests per second per IP)
 	SurveyURL       url.URL       // URL for user feedback survey
+	CustomLogoURL   string        // URL for custom logo image in the web UI
 }
 
 // DatabaseConfig contains database connection settings