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/ct-keep-open.tpl

@@ -0,0 +1,16 @@
+		<div class="right-float right-padding10 font12" style="float: right;">
+			<label>{lang_entry key="frontend.global.always.open"}</label>
+			<span class="icheck-box-all"><input type="checkbox" {if $keep_entries_open eq "1"}checked="checked"{/if} name="keep_open" id="keep-open" value="1" /></span>
+		</div>
+		<script type="text/javascript">
+		$('.icheck-box-all input').each(function () {ldelim}
+                        var self = $(this);
+                        self.iCheck({ldelim}
+                                checkboxClass: 'icheckbox_square-blue',
+                                radioClass: 'iradio_square-blue',
+                                increaseArea: '20%'
+                        {rdelim});
+                        $('input#keep-open').on('ifChecked', function(event) {ldelim} $("#all-open").click(); {rdelim});
+                        $('input#keep-open').on('ifUnchecked', function(event) {ldelim} $("#all-close").click(); {rdelim});
+                {rdelim});
+                </script>