feat(07-01): add deadline and contact email to all notification emails

All three job notification emails (new submission, edit, deactivation) now include:
- Bewerbungsfrist (deadline) - formatted as DD.MM.YYYY
- Kontakt-E-Mail (contact email)

This provides administrators with complete information about each job posting.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

includes/class-notifications.php

@@ -64,6 +64,14 @@ class DDHH_JM_Notifications {
 		// Get post meta fields
 		$job_location      = get_post_meta( $post->ID, 'job_location', true );
 		$job_type          = get_post_meta( $post->ID, 'job_type', true );
+		$job_deadline      = get_post_meta( $post->ID, 'job_deadline', true );
+		$job_contact_email = get_post_meta( $post->ID, 'job_contact_email', true );
+
+		// Format deadline if present
+		$deadline_formatted = 'Nicht angegeben';
+		if ( ! empty( $job_deadline ) ) {
+			$deadline_formatted = date( 'd.m.Y', strtotime( $job_deadline ) );
+		}
 
 		// Get submission date
 		$submission_date = get_the_date( 'd.m.Y H:i', $post->ID );
@@ -81,6 +89,8 @@ class DDHH_JM_Notifications {
 			"Anbieter: %s (%s)\n" .
 			"Standort: %s\n" .
 			"Art: %s\n" .
+			"Bewerbungsfrist: %s\n" .
+			"Kontakt-E-Mail: %s\n" .
 			"Eingereicht am: %s\n\n" .
 			"Prüfen Sie das Stellenangebot hier:\n%s\n\n" .
 			"---\n" .
@@ -90,6 +100,8 @@ class DDHH_JM_Notifications {
 			$author_org,
 			$job_location ? $job_location : 'Nicht angegeben',
 			$job_type ? $job_type : 'Nicht angegeben',
+			$deadline_formatted,
+			$job_contact_email ? $job_contact_email : 'Nicht angegeben',
 			$submission_date,
 			$edit_link
 		);
@@ -146,6 +158,14 @@ class DDHH_JM_Notifications {
 		// Get post meta fields
 		$job_location      = get_post_meta( $post->ID, 'job_location', true );
 		$job_type          = get_post_meta( $post->ID, 'job_type', true );
+		$job_deadline      = get_post_meta( $post->ID, 'job_deadline', true );
+		$job_contact_email = get_post_meta( $post->ID, 'job_contact_email', true );
+
+		// Format deadline if present
+		$deadline_formatted = 'Nicht angegeben';
+		if ( ! empty( $job_deadline ) ) {
+			$deadline_formatted = date( 'd.m.Y', strtotime( $job_deadline ) );
+		}
 
 		// Get submission date
 		$submission_date = current_time( 'd.m.Y H:i' );
@@ -163,6 +183,8 @@ class DDHH_JM_Notifications {
 			"Anbieter: %s (%s)\n" .
 			"Standort: %s\n" .
 			"Art: %s\n" .
+			"Bewerbungsfrist: %s\n" .
+			"Kontakt-E-Mail: %s\n" .
 			"Bearbeitet am: %s\n\n" .
 			"Prüfen Sie das Stellenangebot hier:\n%s\n\n" .
 			"---\n" .
@@ -172,6 +194,8 @@ class DDHH_JM_Notifications {
 			$author_org,
 			$job_location ? $job_location : 'Nicht angegeben',
 			$job_type ? $job_type : 'Nicht angegeben',
+			$deadline_formatted,
+			$job_contact_email ? $job_contact_email : 'Nicht angegeben',
 			$submission_date,
 			$edit_link
 		);
@@ -235,6 +259,14 @@ class DDHH_JM_Notifications {
 		// Get post meta fields
 		$job_location      = get_post_meta( $post->ID, 'job_location', true );
 		$job_type          = get_post_meta( $post->ID, 'job_type', true );
+		$job_deadline      = get_post_meta( $post->ID, 'job_deadline', true );
+		$job_contact_email = get_post_meta( $post->ID, 'job_contact_email', true );
+
+		// Format deadline if present
+		$deadline_formatted = 'Nicht angegeben';
+		if ( ! empty( $job_deadline ) ) {
+			$deadline_formatted = date( 'd.m.Y', strtotime( $job_deadline ) );
+		}
 
 		// Get deactivation reason from post meta
 		$deactivation_reason = get_post_meta( $post->ID, 'job_deactivation_reason', true );
@@ -258,6 +290,8 @@ class DDHH_JM_Notifications {
 			"Anbieter: %s (%s)\n" .
 			"Standort: %s\n" .
 			"Art: %s\n" .
+			"Bewerbungsfrist: %s\n" .
+			"Kontakt-E-Mail: %s\n" .
 			"Deaktiviert am: %s\n\n" .
 			"Grund für Deaktivierung:\n%s\n\n" .
 			"Stelle ansehen:\n%s\n\n" .
@@ -268,6 +302,8 @@ class DDHH_JM_Notifications {
 			$author_org,
 			$job_location ? $job_location : 'Nicht angegeben',
 			$job_type ? $job_type : 'Nicht angegeben',
+			$deadline_formatted,
+			$job_contact_email ? $job_contact_email : 'Nicht angegeben',
 			$deactivation_date,
 			$deactivation_reason ? $deactivation_reason : 'Nicht angegeben',
 			$edit_link