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/bootstrap.php

@@ -0,0 +1,48 @@
+<?php
+/**
+ * bootstrap.php
+ *
+ * Initialisierung der Anwendung
+ * - Config laden
+ * - Session starten
+ * - DB-Verbindung über _sql.php
+ * - Helper einbinden
+ */
+
+/* =========================
+ * Config laden
+ * ========================= */
+require_once __DIR__ . '/config.php';
+// TODO: Config-Datei mit DB-Zugang, Pfaden, globalen Settings füllen
+
+/* =========================
+ * Session starten
+ * ========================= */
+session_start();
+// TODO: Single-User Auth prüfen
+// z.B. $_SESSION['user'] setzen oder Login erzwingen
+
+/* =========================
+ * DB-Verbindung initialisieren
+ * ========================= */
+require_once __DIR__ . '/lib/_sql.php';
+
+// TODO: Host, User, Passwort, DB aus config.php nutzen
+$sql = new SQL(
+    DB_HOST,      // z.B. localhost
+    DB_USER,      // z.B. netdoc
+    DB_PASSWORD,  // z.B. netdoc
+    DB_NAME       // z.B. netdoc
+);
+
+/* =========================
+ * Helper laden
+ * ========================= */
+require_once __DIR__ . '/lib/helpers.php';
+// TODO: Globale Funktionen: escape, redirect, flash messages, etc.
+
+/* =========================
+ * Optional: Fehlerbehandlung
+ * ========================= */
+// error_reporting(E_ALL);
+// ini_set('display_errors', 1);