Add Docker and Coolify deployment setup

Add the container configuration, environment templates, and storage settings needed to deploy SPOTA with Docker and Coolify.

Dockerfile.coolify

@@ -0,0 +1,31 @@
+FROM php:8.2-apache-bookworm
+
+RUN rm -rf /var/lib/apt/lists/* \
+    && apt-get clean \
+    && apt-get update \
+    && apt-get install -y --no-install-recommends \
+        libcurl4-openssl-dev \
+        libfreetype6-dev \
+        libjpeg62-turbo-dev \
+        libonig-dev \
+        libpng-dev \
+        libwebp-dev \
+        libzip-dev \
+        unzip \
+    && docker-php-ext-configure gd --with-freetype --with-jpeg --with-webp \
+    && docker-php-ext-install -j"$(nproc)" pdo_mysql mysqli gd curl zip mbstring exif \
+    && a2enmod rewrite headers \
+    && printf 'ServerName localhost\n' > /etc/apache2/conf-available/server-name.conf \
+    && a2enconf server-name \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY docker/php.ini /usr/local/etc/php/conf.d/spota.ini
+COPY docker/apache-vhost.conf /etc/apache2/sites-available/000-default.conf
+
+WORKDIR /var/www/html
+COPY . /var/www/html/
+
+RUN mkdir -p /var/www/html/files /var/www/html/img /tmp/spota_sessions \
+    && chown -R www-data:www-data /var/www/html /tmp/spota_sessions
+
+EXPOSE 80