fix: resolve known issues and improve code standards

- Fix known bugs in user, plan, and server modules
- Standardize code formatting and structure
- Optimize database queries and model relationships
- Improve request validation and error handling
- Update admin controllers for better consistency

database/migrations/2025_01_04_optimize_plan_table.php

@@ -122,7 +122,7 @@ return new class extends Migration {
             $table->integer('group_id')->change();
             $table->integer('transfer_enable')->change();
             $table->integer('speed_limit')->nullable()->change();
-            $table->boolean('reset_traffic_method')->nullable()->change();
+            $table->integer('reset_traffic_method')->nullable()->change();
             $table->integer('capacity_limit')->nullable()->change();
         });
     }