Initialer Commit: Kundenverwaltung (PHP/Smarty)

Bestehende Codebasis als Ausgangsstand aufgenommen.

- .gitignore: Kundendaten (uploads_*), Smarty-Compile-Cache
  (templates_c), Laufzeit-Temp und Datenbank-Dumps ausgeschlossen;
  Verzeichnisstruktur ueber .gitkeep erhalten
- .gitattributes: Zeilenenden normalisiert (LF im Repo),
  Binaerformate markiert
- db-backup.php: MySQL-Zugangsdaten kommen jetzt wie im Rest der
  Anwendung aus der externen Konfiguration statt hartkodiert aus der
  Datei; Passwort wird ueber eine temporaere Optionsdatei statt per
  Kommandozeile uebergeben, Fehler von mysqldump/gzip werden gemeldet,
  Aufraeumen aelterer Backups berechnet Jahr und Monat konsistent

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

spellcheck/themes/modern/context-menu.css

@@ -0,0 +1,163 @@
+
+.livespell_redwiggle {
+	background-image:url(wiggle.png);
+	background-repeat:repeat-x;
+	background-position:bottom;
+	cursor: default;
+
+}
+h2.spellnofify{
+	font: bold 100% "Lucida Grande",Arial,sans-serif;
+    margin: 0;
+    padding: 0.5em 2em 0.5em 0.75em;
+    text-align: left;
+    text-shadow: 0 1px 0 #FFFFFF;
+}
+.livespell_greenwiggle {
+	background-image:url(gwiggle.png);
+	background-repeat:repeat-x;
+	background-position:bottom;
+	cursor: default;
+	
+}
+.livespell_textarea {
+	border:1px solid #999;
+	background-color:#FFF;
+	width:173px;
+	height:100px;
+	font-size:13px;
+	padding:3px;
+	margin:0px;
+	overflow:auto;
+	font-family: monospace;
+	line-height:13.5px;
+	overflow:auto;
+	white-space: pre-wrap;
+	overflow-y: auto;
+	overflow-x: auto;
+	word-wrap:break-word;
+	display:inline-block;
+	zoom:1; *display: inline; _height: 30px;
+	cursor:text;
+	clear:both;
+}
+
+
+.livespell_textarea p 
+{
+   margin-top:0;
+   margin-bottom:0;
+}
+
+#livespell___contextmenu {
+	margin: 0;
+	padding: 0;
+	position: absolute;
+	z-index:111111;
+	overflow:visible;
+		opacity:.95;
+}
+#livespell___contextmenu li.ls_sug{
+		font-size:10px;
+font-weight:bold;
+}
+
+#livespell___contextmenu ul {
+	
+	width:170px;
+	-moz-border-radius-topleft:4px;
+	-moz-border-radius-topright:4px;
+	-moz-border-radius-bottomleft:4px;
+	-moz-border-radius-bottomright:4px;
+	-webkit-border-bottom-right-radius: 4px;
+	-webkit-border-top-right-radius: 4px;	
+	-webkit-border-bottom-left-radius: 4px;
+	-webkit-border-top-left-radius: 4px;
+	
+	-moz-box-shadow:0px 3px 5px #bbb;
+	
+
+	cursor:default;
+	border:1px solid #000;
+	margin: 0;
+
+	padding: 5px !important; /* Major browsers other than IE 6 and below respect the importance immediately */
+	padding: 2px;
+
+	padding-right: 10px;
+	padding-bottom: 7px;
+	list-style-type: none;
+	font-size:10px;
+	background-color:#fff;
+	color:#111;
+	font-family: "Trebuchet", Arial, sans-serif;
+}
+
+#livespell___contextmenu hr {
+	border: 0;
+	margin: 0;
+	border: 0;
+	border-bottom:	1px dotted #666;
+	padding:0;
+}
+#livespell___contextmenu li.ls_hr{
+padding:none;
+margin:none;
+height:5px;
+}
+
+#livespell___contextmenu a {
+	padding: 2px;
+	cursor:default;
+	display:block;
+	width:100%;
+	color:#000;
+	text-decoration:none;
+	padding-left:1px;
+	font-size:13px;
+}
+#livespell___contextmenu a:hover {
+	background-color:#3d60f5;
+	color:#FFF;
+}
+#livespell___contextmenu select {
+	border:none;
+	color:#333;
+	font-size:12px;
+	width:98%;
+}
+#livespell___contextmenu input {
+	border:none;
+	color:#333;
+	font-size:smaller;
+}
+#livespell___contextmenu label {
+	font-size:smaller;
+	margin:0;
+	padding:0;
+	height:15px;
+	border-collapse:collapse;
+	border:none;
+	color:#333;
+	background-color:#fff;
+}
+#livespell_contextmenu_multilang_container_noscroll {
+	width:140px;
+	border: 1px dotted #ccc;
+	margin-top:5px;
+}
+.livespell_contextmenu_multilang_container_scroll {
+	width:140px;
+	overflow:auto;
+	height:115px;
+	border: 1px dotted #ccc;
+	margin-top:5px;
+}
+.livespell_invisible {
+	
+	filter:alpha(opacity=0);
+	-moz-opacity:0;
+	-khtml-opacity: 0;
+	opacity: 0;
+	
+}