restore: bring back f8a1310 (security review) state

Restores all files to the f8a1310 security-review snapshot as requested,
plus the 2 boot-critical fixes from a24c8a2 (config/session.php env()
instead of app()->environment(), and removal of the duplicate $activeTab
in ProjectMap.php) so the application actually boots.

Forward commit, no history rewrite. The 7d854ff state remains in history.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/Models/User.php

@@ -20,10 +20,11 @@ class User extends Authenticatable
      * @var list<string>
      */
     protected $fillable = [
-        'name', 'title', 'first_name', 'last_name',
-        'email', 'password',
-        'status', 'valid_from', 'valid_until',
-        'company_id', 'phone', 'address', 'notes',
+        'name',
+        'email',
+        'password', // Intentionally kept: required for registration factory and seeding.
+                    // Sensitive — never pass unvalidated user input directly.
+                    // email_verified_at and remember_token are intentionally excluded.
     ];
 
     /**
@@ -45,16 +46,9 @@ class User extends Authenticatable
     {
         return [
             'email_verified_at' => 'datetime',
-            'password'          => 'hashed',
-            'valid_from'        => 'date',
-            'valid_until'       => 'date',
+            'password' => 'hashed',
         ];
     }
-
-    public function company()
-    {
-        return $this->belongsTo(\App\Models\Company::class);
-    }
     // Many-to-many with projects
     public function projects()
     {