refactor: Clean up logging system with LOG_LEVEL filtering

- Add LOG_LEVEL env variable support (debug, info, warn, error)
- Default to 'info' level for production-ready logs
- Integrate Morgan HTTP logging with custom logger
- Remove console.logs and replace with custom logger
- Remove sensitive password debug logs from email service
- Remove noisy warn logs from email sync and event notifier
- Add gray color for timestamps to improve readability

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/services/todo.service.js

@@ -142,7 +142,6 @@ export const getTodoById = async (todoId) => {
  */
 export const createTodo = async (userId, data) => {
   const { title, description, projectId, companyId, assignedUserIds, status, priority, dueDate } = data;
-  console.log('Service createTodo - assignedUserIds:', assignedUserIds);
 
   // Verify project exists if provided
   if (projectId) {
@@ -205,10 +204,7 @@ export const createTodo = async (userId, data) => {
       assignedBy: userId,
     }));
 
-    console.log('Inserting todo_users:', todoUserInserts);
     await db.insert(todoUsers).values(todoUserInserts);
-  } else {
-    console.log('No users to assign - assignedUserIds:', assignedUserIds);
   }
 
   return newTodo;