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>

js/tooltips/changelog.txt

@@ -0,0 +1,38 @@
+1.3
+---
+
+* Added fade option (duration in ms) for fading in/out tooltips; IE <= 6 is excluded when bgiframe plugin is included
+* Fixed imagemaps in IE, added back example
+* Added positionLeft-option - positions the tooltip to the left of the cursor
+* Remove deprecated $.fn.Tooltip in favor of $.fn.tooltip
+
+1.2
+---
+
+* Improved bodyHandler option to accept HTML strings, DOM elements and jQuery objects as the return value
+* Fixed bug in Safari 3 where to tooltip is initially visible, by first appending to DOM then hiding it
+* Improvement for viewport-border-positioning: Add the classes "viewport-right" and "viewport-bottom" when the element is moved at the viewport border.
+* Moved and enhanced documentation to docs.jquery.com
+* Added examples for bodyHandler: footnote-tooltip and thumbnail
+* Added id option, defaults to "tooltip", override to use a different id in your stylesheet
+* Moved demo tooltip style to screen.css
+* Moved demo files to demo folder and dependencies to lib folder
+* Dropped image map example - completely incompatible with IE; image maps aren't supported anymore
+
+1.1
+---
+
+* Use bgiframe-plugin if available
+* Use dimensions-plugin to calculate viewport
+* Expose global blocked-property via $.Tooltip.blocked to programmatically disable all tooltips
+* Fixed image maps in IE by setting the alt-attribute to an empty string
+* Removed event-option (only hover-tooltips now)
+* Simplified event-handling (using hover instead of mouseover und mouseout)
+* Added another "pretty" example
+* Added top and left options to specify tooltip offset
+* Reworked example page: New layout, code examples
+
+1.0
+---
+
+* first release considered stable