feat: Refactor template handling, improve scheduler functions, and add timezone utilities

- Moved Jinja2 template setup to a shared configuration file (templates_config.py) for consistent usage across routers.
- Introduced timezone utilities in a new module (timezone.py) to handle UTC to local time conversions and formatting.
- Updated all relevant routers to use the new shared template configuration and timezone filters.
- Enhanced templates to utilize local time formatting for various datetime fields, improving user experience with timezone awareness.

templates/partials/projects/unified_files.html

@@ -24,7 +24,7 @@
                         </svg>
                         <div>
                             <div class="font-semibold text-gray-900 dark:text-white">
-                                {{ session.started_at.strftime('%Y-%m-%d %H:%M') if session.started_at else 'Unknown Date' }}
+                                {{ session.started_at|local_datetime if session.started_at else 'Unknown Date' }}
                             </div>
                             <div class="text-xs text-gray-500 dark:text-gray-400">
                                 {% if unit %}{{ unit.id }}{% else %}Unknown Unit{% endif %}
@@ -155,7 +155,7 @@
                                 <!-- Download Time -->
                                 {% if file.downloaded_at %}
                                 <span class="mx-1">•</span>
-                                {{ file.downloaded_at.strftime('%Y-%m-%d %H:%M') }}
+                                {{ file.downloaded_at|local_datetime }}
                                 {% endif %}
 
                                 <!-- Source Info from Metadata -->