fix(ci): fix autoloading and bootstrap cache issues causing test failures

Three changes:
1. Add composer dump-autoload after composer install in all jobs
   (validate, test, security) — ensures fresh autoloader mapping
2. Replace config:clear + view:clear with optimize:clear in test job
   — clears bootstrap/cache (services.php, packages.php) which
   caused 'Class not found' for Sanctum\Guard, 'not instantiable'
   for AttendanceMailerService, and 'factory() undefined' for User
3. Add explicit $incrementing = true to Configuration model
   — ensures Eloquent treats id as auto-increment (belt-and-suspenders
   for SQLite NOT NULL constraint failures)

app/Models/Configuration.php

@@ -10,6 +10,7 @@ class Configuration extends BaseModel
 
     // The legacy table only has id/config_key/config_value.
     public $timestamps = false;
+    public $incrementing = true;
 
     protected $fillable = [
         'config_key',