feat: Add comprehensive documentation suite and reorganize project structure

- Created complete documentation in docs/ directory
- Added PROJECT_OVERVIEW.md with feature highlights and getting started guide
- Added ARCHITECTURE.md with system design and technical details
- Added SECURITY.md with comprehensive security implementation guide
- Added DEVELOPMENT.md with development workflows and best practices
- Added DEPLOYMENT.md with production deployment instructions
- Added API.md with complete REST API documentation
- Added CONTRIBUTING.md with contribution guidelines
- Added CHANGELOG.md with version history and migration notes
- Reorganized all documentation files into docs/ directory for better organization
- Updated README.md with proper documentation links and quick navigation
- Enhanced project structure with professional documentation standards

f_templates/tpl_frontend/tpl_header/tpl_notify.tpl

@@ -0,0 +1,8 @@
+	    {if $error_message ne ""}{assign var=notif_class value="error"}{assign var=the_message value=$error_message}{elseif $notice_message ne ""}{assign var=notif_class value="notice"}{assign var=the_message value=$notice_message}{/if}
+	    <!-- NOTIFICATION CONTAINER -->
+	    {if $error_message ne "" or $notice_message ne ""} 
+		<div class="{$notif_class}-message" id="{$notif_class}-message" onclick="$(this).replaceWith(''); $('#cb-response').replaceWith(''); $('#cb-response-wrap').replaceWith(''); resizeDelimiter();">
+		    <p class="{$notif_class}-message-text">{$the_message}</p>
+		</div>
+		<script type="text/javascript">$(document).ready(function(){ldelim}$(document).on("click","#{$notif_class}-message",function(){ldelim}$("#{$notif_class}-message").replaceWith("");$("#cb-response").replaceWith("");$("#cb-response-wrap").replaceWith("");resizeDelimiter();if($("#wrapper").hasClass("tpl_shorts")){ldelim}var sh=!$('#view-player').hasClass('bottom-comments')?$('.video-js').height():360;var ct=sh-($('#comment-load .file-views-nr').height()+$('#comment-load #comm-post-response').height()+$('#comment-load #comm-post-form').height()+20);$('.posted-comments').css('height',ct);{rdelim}{rdelim});{rdelim});</script>
+	    {/if} <!-- END NOTIFICATION CONTAINER -->