Add log level configuration support (#272)

Add log level configuration support via config.yaml and UI settings.

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Co-authored-by: Shantur Rathore <i@shantur.com>

packages/server/src/config/schema.ts

@@ -26,6 +26,7 @@ const PreferencesSchema = z
   showUsageMetrics: z.boolean().default(true),
   autoCleanupBlankSessions: z.boolean().default(true),
   listeningMode: z.enum(["local", "all"]).default("local"),
+  logLevel: z.enum(["DEBUG", "INFO", "WARN", "ERROR"]).default("DEBUG"),
 
   // OS notifications
   osNotificationsEnabled: z.boolean().default(false),