feat: M2 database migration runner with Phinx and initial schema

docker/README.md

@@ -53,8 +53,8 @@ independent of your current working directory and propagate exit codes.
 ./dev.sh lint        # run composer lint inside the app container
 ./dev.sh assets      # build minified CSS inside the assets container
 ./dev.sh watch       # start Tailwind watch inside the assets container
-./dev.sh migrate     # unavailable until M2 (#12); exits nonzero
-./dev.sh seed        # unavailable until M2 (#12); exits nonzero
+./dev.sh migrate     # run database migrations (M2 #12)
+./dev.sh seed        # seed default reference data (M2 #12)
 ```
 
 `down --volumes` and `down -v` are blocked by the wrapper. Never remove the named

docker/php/Dockerfile

@@ -1,7 +1,7 @@
 FROM php:8.3-fpm-bookworm
 
-RUN apt-get update && apt-get install -y --no-install-recommends libonig-dev libxml2-dev unzip \
-    && docker-php-ext-install mbstring dom \
+RUN apt-get update && apt-get install -y --no-install-recommends libonig-dev libxml2-dev libpq-dev unzip \
+    && docker-php-ext-install mbstring dom pdo_pgsql \
     && rm -rf /var/lib/apt/lists/*
 COPY --from=composer:2 /usr/bin/composer /usr/local/bin/composer
 WORKDIR /var/www/html