feat: add MariaDB Docker container for Darkwatch

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.env.example

@@ -0,0 +1,8 @@
+DB_HOST=127.0.0.1
+DB_PORT=3307
+DB_NAME=darkwatch
+DB_USER=darkwatch
+DB_PASSWORD=darkwatch_dev
+DB_ROOT_PASSWORD=rootpassword_dev
+JWT_SECRET=change_me_in_production
+CLIENT_URL=http://localhost:5173

.gitignore

@@ -2,3 +2,5 @@ node_modules/
 server/data/
 .superpowers/
 .worktrees/
+server/.env
+*.db

docker-compose.yml

@@ -0,0 +1,18 @@
+name: darkwatch
+services:
+  darkwatch-maria:
+    image: mariadb:11
+    container_name: darkwatch-maria
+    restart: unless-stopped
+    volumes:
+      - darkwatch-mariadb-data:/var/lib/mysql
+    ports:
+      - "3307:3306"
+    environment:
+      MARIADB_ROOT_PASSWORD: ${DB_ROOT_PASSWORD}
+      MARIADB_DATABASE: ${DB_NAME}
+      MARIADB_USER: ${DB_USER}
+      MARIADB_PASSWORD: ${DB_PASSWORD}
+
+volumes:
+  darkwatch-mariadb-data: