fix(models): replace forceFill/forceCreate with fill/create and add fillable guards

Replace all uses of `forceFill`, `forceCreate`, and `forceFill` with their
non-force equivalents across models, actions, controllers, and Livewire
components. Add explicit `$fillable` arrays to all affected Eloquent models
to enforce mass assignment protection.

Add ModelFillableCreationTest and ModelFillableRegressionTest to verify that
model creation respects fillable constraints and prevent regressions.

tests/Feature/ComposePreviewFqdnTest.php

@@ -14,7 +14,7 @@ it('populates fqdn from docker_compose_domains after generate_preview_fqdn_compo
         ]),
     ]);
 
-    $preview = ApplicationPreview::forceCreate([
+    $preview = ApplicationPreview::create([
         'application_id' => $application->id,
         'pull_request_id' => 42,
         'pull_request_html_url' => 'https://github.com/example/repo/pull/42',
@@ -39,7 +39,7 @@ it('populates fqdn with multiple domains from multiple services', function () {
         ]),
     ]);
 
-    $preview = ApplicationPreview::forceCreate([
+    $preview = ApplicationPreview::create([
         'application_id' => $application->id,
         'pull_request_id' => 7,
         'pull_request_html_url' => 'https://github.com/example/repo/pull/7',
@@ -65,7 +65,7 @@ it('sets fqdn to null when no domains are configured', function () {
         ]),
     ]);
 
-    $preview = ApplicationPreview::forceCreate([
+    $preview = ApplicationPreview::create([
         'application_id' => $application->id,
         'pull_request_id' => 99,
         'pull_request_html_url' => 'https://github.com/example/repo/pull/99',