feat: Implement initial application structure with network view and SVG editor

- Added network-view.js for visualizing network topology with devices and connections.
- Introduced svg-editor.js for managing ports on device types with drag-and-drop functionality.
- Created bootstrap.php for application initialization, including configuration and database connection.
- Established config.php for centralized configuration settings.
- Developed index.php as the main entry point with module-based routing.
- Integrated _sql.php for database abstraction.
- Added auth.php for single-user authentication handling.
- Included helpers.php for utility functions.
- Created modules for managing connections, device types, devices, and floors.
- Implemented database schema in init.sql for locations, buildings, floors, rooms, network outlets, devices, and connections.
- Added Docker support with docker-compose.yml for web and database services.
- Documented database structure and UI/UX concepts in respective markdown files.

app/templates/footer.php

@@ -0,0 +1,19 @@
+<?php
+/**
+ * footer.php
+ *
+ * HTML-Footer, Scripts, evtl. Modale oder Notifications
+ * Wird am Ende jeder Seite eingebunden
+ */
+?>
+</main>
+
+<footer>
+    <p>&copy; <?php echo date('Y'); ?> Meine Firma - Netzwerk Dokumentation</p>
+
+    <!-- TODO: Optional: Statusanzeige, Debug-Info, Session-Hinweis -->
+</footer>
+
+<!-- TODO: evtl. JS für modale Fenster oder Flash Messages -->
+</body>
+</html>