run in docker, and work through more than one account

Both taken from TheNetsky/Microsoft-Rewards-Script, which packages a container
and handles several accounts. Approach only: that project is GPL-3.0 and this
one MIT, so no code crosses over.

**Accounts.** Rewards is per Microsoft account and the browser profile holds
the sign-in, so an account here is a profile directory. REWARDS_ACCOUNTS takes
a comma separated list and gives each its own directory under the configured
one. They run in sequence, and a profile that will not start is reported and
skipped rather than ending the run. Left unset, a run uses the single profile
exactly as before.

Names are validated rather than trusted: they become directory names, so
"../escape" is refused instead of quietly writing outside data-dir.

**Docker.** The image carries only what main.py actually reaches, selenium and
numpy. pygetwindow, keyboard, matplotlib and pygame are used solely by the
recording and visualisation scripts, and two of those are Windows-only, so
none of them belong in a container. msedgedriver is pinned at build time to
the Edge the image installed rather than to latest, which drifts from it
between releases.

QUERY_SOURCE defaults to trends in the image, so a container needs no Ollama
account and no model download at all.

That default turned out to require a fix. queries.py imported llm_utils at
module scope, which imports ollama, so a trends-only install still needed the
ollama package: exactly what running in a minimal image is good at exposing.
The import is now made inside the llm branch, and the wordlist fallback reads
nouns.txt directly rather than borrowing llm_utils.get_random_noun.

REWARDS_HEADLESS drives the headless flags. The window size is set explicitly
because the pointer code works in viewport coordinates and the default
headless window is small enough to put cards out of reach, which is the
MoveTargetOutOfBoundsException from #19. Verified on the host that
move_to_element and human_like_click both work headless before relying on it.

Verified in the built image: Edge 151.0.4129.107 with a driver of exactly the
same build, the trends feed reachable from inside, Edge driven to bing.com and
rewards.bing.com at 1920x1080, and REWARDS_ACCOUNTS producing separate profile
directories with traversal refused.

docker-compose.yml

@@ -0,0 +1,29 @@
+# docker compose run --rm rewards-farmer
+#
+# Sign-in has to happen once by hand before this is useful: the profile in
+# data-dir starts logged out. See the Docker section of the README.
+
+services:
+  rewards-farmer:
+    build: .
+    image: rewards-farmer
+    # Chromium wants more than the default 64MB of shared memory and crashes
+    # partway through a page without it.
+    shm_size: 1gb
+    environment:
+      # trends needs no account or model, which is why it is the default here.
+      # To use a model instead, set QUERY_SOURCE=llm and give OLLAMA_HOST an
+      # address the container can reach: localhost inside a container is the
+      # container, so ollama running on the host is host.docker.internal, and
+      # 0.0.0.0 is a bind address that cannot be dialled at all.
+      #
+      #   QUERY_SOURCE=llm OLLAMA_HOST=host.docker.internal:11434 docker compose run --rm rewards-farmer
+      QUERY_SOURCE: ${QUERY_SOURCE:-trends}
+      REWARDS_HEADLESS: "1"
+      # Comma separated, one profile directory each. Leave unset for a single
+      # profile in data-dir, which is the existing behaviour.
+      REWARDS_ACCOUNTS: ${REWARDS_ACCOUNTS:-}
+      OLLAMA_HOST: ${OLLAMA_HOST:-}
+    volumes:
+      # Keeps the sign-in across container rebuilds.
+      - ./data-dir:/app/data-dir