perf: add BuildKit npm cache mounts, add compose:down script

- RUN --mount=type=cache,target=/root/.npm for both npm install steps
  Persists npm cache across builds so unchanged deps aren't re-downloaded
- deploy:staging now targets ae_app only (skip api/nginx rebuild)
- compose:down includes --profile database to remove mariadb/pma containers
  and cleanly release ae_dev_net (fixes 'Resource is still in use' warning)

Dockerfile

@@ -6,7 +6,7 @@ WORKDIR /app
 # Install dependencies first for better Docker layer caching.
 # This step only reruns if package.json or package-lock.json changes.
 COPY package*.json ./
-RUN npm install
+RUN --mount=type=cache,target=/root/.npm npm install
 
 # Copy the rest of the source code.
 COPY . .
@@ -38,7 +38,7 @@ COPY --from=builder /app/build .
 COPY --from=builder /app/package.json .
 
 # Install only production dependencies for a smaller, cleaner image.
-RUN npm install --omit=dev
+RUN --mount=type=cache,target=/root/.npm npm install --omit=dev
 
 # Copy the resulting .env.production file to .env.
 # adapter-node reads from .env at runtime for non-PUBLIC_ variables.

package.json

@@ -17,8 +17,9 @@
         "format": "prettier --write .",
         "test:integration": "playwright test",
         "test:unit": "vitest",
-        "deploy:staging": "docker compose -f ../aether_container_env/docker-compose.yml up -d --build --remove-orphans",
-        "deploy:prod": "docker compose -f ../aether_container_env/docker-compose.yml build --build-arg BUILD_MODE=prod && docker compose -f ../aether_container_env/docker-compose.yml up -d --remove-orphans"
+        "deploy:staging": "docker compose -f ../aether_container_env/docker-compose.yml up -d --build ae_app",
+        "deploy:prod": "docker compose -f ../aether_container_env/docker-compose.yml build --build-arg BUILD_MODE=prod && docker compose -f ../aether_container_env/docker-compose.yml up -d --remove-orphans",
+        "compose:down": "docker compose -f ../aether_container_env/docker-compose.yml --profile database down"
     },
     "devDependencies": {
         "@eslint/js": "^9.39.1",