feat: add id field to professional models and enable navigation to agent detail pages

lib/features/home/data/models/landing_page_content.dart

@@ -63,6 +63,7 @@ class TopProfessionalsContent {
 }
 
 class ProfessionalItem {
+  final String? id;
   final String name;
   final String subtitle;
   final String location;
@@ -72,6 +73,7 @@ class ProfessionalItem {
   final double rating;
 
   const ProfessionalItem({
+    this.id,
     required this.name,
     this.subtitle = '',
     this.location = '',
@@ -83,6 +85,7 @@ class ProfessionalItem {
 
   factory ProfessionalItem.fromJson(Map<String, dynamic> json) {
     return ProfessionalItem(
+      id: json['id'] as String?,
       name: json['name'] as String? ?? '',
       subtitle: json['subtitle'] as String? ?? '',
       location: json['location'] as String? ?? '',
@@ -127,6 +130,7 @@ class HeroContent {
 // --- Features Section ---
 
 class FeaturedAgentItem {
+  final String? id;
   final String name;
   final String role;
   final String rating;
@@ -135,6 +139,7 @@ class FeaturedAgentItem {
   final String imageUrl;
 
   const FeaturedAgentItem({
+    this.id,
     this.name = '',
     this.role = '',
     this.rating = '',
@@ -145,6 +150,7 @@ class FeaturedAgentItem {
 
   factory FeaturedAgentItem.fromJson(Map<String, dynamic> json) {
     return FeaturedAgentItem(
+      id: json['id'] as String?,
       name: json['name'] as String? ?? '',
       role: json['role'] as String? ?? '',
       rating: json['rating'] as String? ?? '',