Add Docker setup for running Strapi locally

apps/cms/Dockerfile.dev + root docker-compose.yml give a one-command
way to run the CMS in a container for testing (docker compose up
cms), with the shared content/ directory mounted so it matches the
host dev setup. apps/cms/Dockerfile is a production multi-stage build
for later Dokploy deployment. Uses node:24-bookworm-slim to match the
local Node version and get glibc prebuilt binaries for better-sqlite3
without needing a native build toolchain in the final image.

Verified: both images build, the dev container boots Strapi
successfully, admin panel and API routes are reachable, and the
mounted content/ volume resolves at the same relative path the future
sync provider will expect.

apps/cms/Dockerfile.dev

@@ -0,0 +1,30 @@
+# Local testing image for the Strapi CMS — runs `strapi develop` with the
+# workspace's own lockfile, so it matches what `pnpm --filter cms develop`
+# does on the host. Not for production (see Dockerfile for that).
+#
+# Build context must be the repo root (pnpm workspace root), e.g.:
+#   docker build -f apps/cms/Dockerfile.dev -t andwati-cms-dev .
+# or simply: docker compose up cms
+
+FROM node:24-bookworm-slim
+
+# better-sqlite3 needs to compile if no prebuilt binary matches the platform.
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    python3 make g++ \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN corepack enable
+WORKDIR /app
+
+# Copy just the manifests first so `pnpm install` is cached across rebuilds
+# unless a package.json actually changes.
+COPY pnpm-workspace.yaml pnpm-lock.yaml package.json ./
+COPY apps/site/package.json apps/site/package.json
+COPY apps/cms/package.json apps/cms/package.json
+RUN pnpm install --frozen-lockfile --filter cms
+
+COPY apps/cms apps/cms
+
+WORKDIR /app/apps/cms
+EXPOSE 1337
+CMD ["pnpm", "develop"]