feat: add preliminary docker-compose and default .env

.env.default

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+# ========== Global config ==========
+
+
+# ============= Backend =============
+BACKEND_PORT=6567              # Port on which the backend service should listen to requests.
+
+# Postgres and TypeORM
+PG_USER=kitty
+PG_PASS=CHANGEME
+PG_HOST=127.0.0.1
+PG_PORT=5432
+PG_DB=kittyurl
+
+# Site info
+PUBLIC_URL=https://example.com # Publicly accessible website root, used for rewrites. Note there is no trailing slash in the URL.
+IS_PROXIED=false               # Set to `true` if behind a reverse proxy, like apache/nginx.
+USE_SUBDOMAINS=true            # Whether to use subdomains for URL generation.
+DEBUG=false                    # Set to `false` to disable some features not meant to be seen publicly (like swagger documentation).
+
+# ============  Frontend ============
+FRONTEND_PORT=6568             # Port on which the frontend service should listen to requests.

.gitignore

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+# .env
+.env
+

docker-compose.yaml

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+# kittyurl docker compose config
+# 
+# Tip: Please do not change values listed here. Instead, modify your .env file.
+
+name: kittyurl
+services:
+
+  # kittyfe:
+  #   container_name: frontend
+  #   image: gitea.7o7.cx/kittyteam/kittyfe:${KITTY_VERSION:-master-latest}
+  #   env_file:
+  #     - .env
+  #   ports:
+  #     - ${FRONTEND_PORT}:6568
+  #   depends_on:
+  #     - kittybe
+  #   restart: unless-stopped
+
+  kittybe:
+    container_name: backend
+    image: gitea.7o7.cx/kittyteam/kittybe:${KITTY_VERSION:-master-latest}
+    env_file:
+      - .env
+    ports:
+      - ${BACKEND_PORT}:6567
+    depends_on:
+      - postgres
+    restart: unless-stopped
+
+  postgres:
+    container_name: database
+    image: "postgres:17.2"
+    # Uncomment to expose DB port:
+    # ports:
+    #   - '5432:5432'
+    environment:
+      POSTGRES_USER: ${PG_USER}
+      POSTGRES_PASSWORD: ${PG_PASS}
+      POSTGRES_DB: ${PG_DB}
+