Initial deploy-only compose for the McDowall instance

Reuses the power-compare image with its own port, env, and data volume.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

README.md

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+# power-compare-mcdowall
+
+Deploy-only repo for a second, fully independent instance of
+[power-compare](https://git.plexultra.com/dlawler489/power-compare), pointed
+at the McDowall plant instead of Kallangur.
+
+It has no source of its own -- it just pulls the same built image
+(`git.plexultra.com/dlawler489/power-compare:main`) and runs it with its own
+`.env`, its own database, and its own port (44597). A code change to
+power-compare only needs pushing there; redeploying this stack picks up the
+new image automatically.
+
+Setup for a fresh deploy:
+1. Deploy this stack via the stack manager.
+2. Create `/app/data/power-compare-mcdowall-persistent/.env` (as seen inside
+   the stack manager's own container) with the real config -- see
+   power-compare's `.env.example` for the shape. Use the same
+   `ISOLARCLOUD_APP_KEY` / `ISOLARCLOUD_APP_SECRET` / `ISOLARCLOUD_OAUTH_APP_ID`
+   as the Kallangur instance (same developer app registration, same
+   account) -- leave `ISOLARCLOUD_PLANT_ID` blank and pick McDowall from the
+   plant list in Settings after connecting, since one account can see both
+   plants. Set `POSTCODE` to McDowall's.
+3. Redeploy so the container picks up the `.env`.
+4. Open Settings, connect the OAuth flow (this instance has its own
+   database, so it needs its own one-time connect even though it's the same
+   account), and pick the McDowall plant from the list.

docker-compose.yml

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+services:
+  power-compare-mcdowall:
+    image: git.plexultra.com/dlawler489/power-compare:main
+    ports:
+      - "44597:8000"
+    env_file:
+      # See the power-compare repo's docker-compose.yml for why this is an
+      # /app/data/... path rather than a real host path: the stack manager
+      # runs `docker compose` inside its own container, so paths here
+      # resolve against ITS filesystem (mounted from
+      # /Users/davidlawler/docker/dockhand on the host), not the real host's.
+      - /app/data/power-compare-mcdowall-persistent/.env
+    environment:
+      - DB_PATH=/data/power_compare.db
+    volumes:
+      # Bind-mount SOURCE, by contrast, is resolved by the real Docker
+      # daemon against the actual host filesystem -- a real host path.
+      - /Users/davidlawler/docker/power-compare-mcdowall-data/data:/data
+    restart: unless-stopped