some more re-org + fixes

src/services/logger.ts

@@ -14,10 +14,14 @@ type LogLevel = 'INFO' | 'WARN' | 'ERROR' | 'DEBUG';
  * methods. Using `unknown[]` is more type-safe than `any[]` and satisfies the linter.
  */
 const log = <T extends unknown[]>(level: LogLevel, message: string, ...args: T) => {
-    const pid = process.pid;
+    // Check if `process` is available (Node.js) vs. browser environment.
+    // This makes the logger "isomorphic" and prevents runtime errors on the client.
+    const envIdentifier = typeof process !== 'undefined' && process.pid
+        ? `PID:${process.pid}`
+        : 'BROWSER';
     const timestamp = getTimestamp();
     // We construct the log message with a timestamp, PID, and level for better context.
-    const logMessage = `[${timestamp}] [PID:${pid}] [${level}] ${message}`;
+    const logMessage = `[${timestamp}] [${envIdentifier}] [${level}] ${message}`;
     
     switch (level) {
         case 'INFO':