fix: Resolve template syntax error in post detail page

- Fix Jinja2 template syntax error on line 180
- Remove duplicate closing div tags that caused template compilation failure
- Clean up HTML structure for proper blog-style layout
- Add test media files for verifying multiple image upload functionality

Blog Layout Features:
- Sequential sections with keywords, text, and images
- Compact photo gallery in sidebar
- Proper section separation with visual hierarchy
- Keywords extracted from **bold** text displayed as tags
- Continuous narrative flow for better storytelling

Technical Fix:
- Resolved 'Encountered unknown tag endif' Jinja2 error
- Fixed mismatched block structure in template
- Ensured proper template compilation and rendering

app/templates/community/post_detail.html

@@ -174,10 +174,6 @@
                         </div>
                     </div>
                 </div>
-            </div>
-                    </div>
-                </div>
-                {% endif %}
 
                 <!-- Comments Section -->
                 <div class="bg-white rounded-2xl shadow-xl overflow-hidden">