feat: match Anbieter Login form styles to Mentor Login and show company name on Jobangebot

Anbieter Login (/anbieter-login/):
- Add auth-forms.css with styles matching the Mentor Login reference
  (navy pill buttons, bold #333 labels at 18px, consistent input sizing)
- Enqueue CSS only on the login page via stored page ID
- Strip legacy inline styles from page content via the_content filter
- Inject "Passwort vergessen?" link after login form
- Pixel-perfect field alignment between registration and login columns
  (matching Formidable's 97px field spacing, label padding, and margins)
- Override Formidable's flex-row submit wrapper for full-width button

Jobangebot (single job_offer):
- Display company name next to provider logo in a flex .job-header container
- Graceful fallback when logo or org name is missing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

includes/class-template.php

@@ -55,9 +55,16 @@ class DDHH_JM_Template {
 			<a href="<?php echo esc_url( get_post_type_archive_link( 'job_offer' ) ); ?>">← Alle Jobangebote</a>
 		</div>
 		<div class="ddhh-job-offer-details">
-			<?php if ( $job_logo ) : ?>
-				<div class="job-logo">
-					<?php echo $job_logo; ?>
+			<?php if ( $job_logo || $author_org ) : ?>
+				<div class="job-header">
+					<?php if ( $job_logo ) : ?>
+						<div class="job-logo">
+							<?php echo $job_logo; ?>
+						</div>
+					<?php endif; ?>
+					<?php if ( $author_org ) : ?>
+						<span class="job-header-org"><?php echo esc_html( $author_org ); ?></span>
+					<?php endif; ?>
 				</div>
 			<?php endif; ?>
 
@@ -137,13 +144,24 @@ class DDHH_JM_Template {
 				.ddhh-job-offer-details {
 					margin: 2em 0;
 				}
-				.ddhh-job-offer-details .job-logo {
+				.ddhh-job-offer-details .job-header {
+					display: flex;
+					align-items: center;
+					gap: 1em;
 					margin-bottom: 2em;
 				}
+				.ddhh-job-offer-details .job-header .job-logo {
+					flex-shrink: 0;
+				}
 				.ddhh-job-offer-details .job-logo img {
 					max-width: 200px;
 					height: auto;
 				}
+				.ddhh-job-offer-details .job-header-org {
+					font-size: 1.4em;
+					font-weight: 600;
+					color: #333;
+				}
 				.ddhh-job-offer-details .job-meta {
 					background: #f5f5f5;
 					padding: 1.5em;