Added Dev Container configuration to simplify local setup

.devcontainer/Dockerfile

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+FROM mcr.microsoft.com/devcontainers/php:1-8.2-bookworm
+# All necessary PHP dependnencies
+RUN apt update && \
+    apt install -y \
+        libpng-dev libjpeg-dev libfreetype6-dev \
+        libldap2-dev \
+        build-essential autoconf pkg-config && \
+    docker-php-ext-configure gd --with-freetype --with-jpeg && \
+    docker-php-ext-install gd mysqli ldap && \
+    rm -rf /var/lib/apt/lists/*
+# Enable Xdebug
+RUN XDEBUG_INI="/usr/local/etc/php/conf.d/xdebug.ini" && \
+    mkdir -p "$(dirname "$XDEBUG_INI")" && \
+    if ! php -m | grep -qi xdebug; then \
+        docker-php-ext-install xdebug; \
+    fi && \
+    if [ ! -f "$XDEBUG_INI" ]; then \
+        echo "xdebug.mode=off" > "$XDEBUG_INI" && \
+        echo "xdebug.start_with_request=no" >> "$XDEBUG_INI" && \
+        echo "xdebug.client_host=host.docker.internal" >> "$XDEBUG_INI" && \
+        echo "xdebug.client_port=9003" >> "$XDEBUG_INI"; \
+    else \
+        sed -i '/^zend_extension/d' "$XDEBUG_INI"; \
+        grep -q "xdebug.mode" "$XDEBUG_INI" || echo "xdebug.mode=off" >> "$XDEBUG_INI"; \
+        grep -q "xdebug.start_with_request" "$XDEBUG_INI" || echo "xdebug.start_with_request=no" >> "$XDEBUG_INI"; \
+        grep -q "xdebug.client_host" "$XDEBUG_INI" || echo "xdebug.client_host=host.docker.internal" >> "$XDEBUG_INI"; \
+        grep -q "xdebug.client_port" "$XDEBUG_INI" || echo "xdebug.client_port=9003" >> "$XDEBUG_INI"; \
+    fi
+
+# Optional: confirm extensions are active for debugging
+RUN php -m | grep -E 'mysqli|ldap|gd'

.devcontainer/devcontainer.json

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+{
+	"name": "LibreBooking Dev",
+	"build": {
+		"dockerfile": "Dockerfile"
+	},
+	"features": {
+		"ghcr.io/devcontainers/features/git-lfs:1": {}
+	},
+	"postCreateCommand": "composer install",
+	"postStartCommand": "bash .devcontainer/ldap_setup.sh",
+	"forwardPorts": [
+		8080
+	],
+	"remoteUser": "root"
+}

.devcontainer/setup.sh

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+# Setup LDAP
+mkdir -p plugins/Authentication/Ldap plugins/Authentication/ActiveDirectory
+echo "<?php return ['enabled' => false];" > plugins/Authentication/Ldap/Ldap.config.php
+echo "<?php return ['enabled' => false];" > plugins/Authentication/ActiveDirectory/ActiveDirectory.config.php
+# Copy default config to be usable right away for testing
+cp config/config.dist.php config/config.php