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_backend/tpl_settings/backend-menu-entry4-sub4.tpl

@@ -0,0 +1,50 @@
+        <script type="text/javascript">{include file="f_scripts/be/js/settings-accordion.js"}</script>
+        <script type="text/javascript">{include file="f_scripts/be/js/jquery.nouislider.init.js"}</script>
+	<div class="wdmax entry-list" id="ct-wrapper">
+	    <div class="section-top-bar{if $smarty.get.do eq "add"}-add{else} vs-maskx{/if} left-float top-bottom-padding">
+            	<div class="sortings">{include file="tpl_backend/tpl_settings/ct-save-top.tpl"}{include file="tpl_backend/tpl_settings/ct-cancel-top.tpl"}</div>
+            	<div class="page-actions">{include file="tpl_backend/tpl_settings/ct-save-open-close.tpl"}</div>
+                <div class="clearfix"></div>
+    	    </div>
+    	    <div class="clearfix"></div>
+            
+    	    <div class="vs-mask">{generate_html type="sub_entry" bullet_id="ct-bullet1" entry_id="ct-entry-details1" bb=1}</div>
+            
+            {if $smarty.get.do eq "add"}
+            <div class="clearfix"></div>
+            <div class="section-bottom-bar{if $smarty.get.do eq "add"}-add{else} vs-maskx{/if} left-float top-bottom-padding">
+                <div class="clearfix"></div>
+                {include file="tpl_backend/tpl_settings/ct-save-top.tpl"}{include file="tpl_backend/tpl_settings/ct-cancel-top.tpl"}
+            </div>
+            {/if}
+	</div>
+
+	{include file="tpl_backend/tpl_settings/ct-switch-js.tpl"}
+	{include file="tpl_backend/tpl_settings/ct-actions-js.tpl"}
+	<script type="text/javascript">{include file="f_scripts/be/js/tip.js"}</script>
+	<script type="text/javascript">
+
+        $(document).ready(function () {ldelim}
+                $('.icheck-box input').each(function () {ldelim}
+                        var self = $(this);
+                        self.iCheck({ldelim}
+                                checkboxClass: 'icheckbox_square-blue',
+                                radioClass: 'iradio_square-blue',
+                                increaseArea: '20%'
+                                
+                        {rdelim});
+                {rdelim});
+                $('.icheck-box input').on('ifChecked', function(event){ldelim} var _id = $(this).val(); $("#hcs-id" + _id).prop('checked', true); {rdelim});
+                $('.icheck-box input').on('ifUnchecked', function(event){ldelim} var _id = $(this).val(); $("#hcs-id" + _id).prop('checked', false); {rdelim});
+                
+                $("#entry-action-buttons .dl-trigger").on("click", function(){ldelim}
+        		if ($("#entry-action-buttons ul.dl-menu").hasClass("dl-menuopen")) {ldelim}
+                            setTimeout(function () {ldelim}
+                                    $("#choices-ipp_select").slideUp(300, function(){ldelim}$('#ct-wrapper').unbind('click', bodyHideSelect);{rdelim});
+                            {rdelim}, 100);
+                        {rdelim}
+		{rdelim});
+        {rdelim});
+
+        </script>
+