Six silent failures found by installing this on a live system

Migrated the reference site off the YAML packages and onto the add-on. Every
bug below presented identically: the add-on starts, logs "started", serves its
UI, and cannot do its job.

- run.sh needs #!/usr/bin/with-contenv sh. s6-overlay sanitises the environment
  for services, so a plain shebang means SUPERVISOR_TOKEN is absent and every
  Core API call is 401 - while homeassistant_api: true makes permissions look
  granted. Startup now prints the token length and probes the API.
- Supervisor keys the image by config.yaml `version`, so rebuilding without a
  bump reuses the old image. Two fixes appeared not to work because of it.
- Alpine is musl and has no aiohttp wheel on PyPI; deps now come from apk so
  nothing compiles on a client's Pi.
- Alpine ships paho-mqtt 1.x, which has no CallbackAPIVersion. That raised at
  construction and took the control loop down with it - so MQTT setup is now
  wrapped too. Observability must never be able to stop the controller.
- MQTT discovery is published from on_connect: paho silently drops QoS-0
  publishes issued before the CONNACK, so the previous code announced nothing
  while logging "MQTT connected".
- Repeated failures now log once a minute. Six warnings a second rolled the log
  buffer and destroyed the startup diagnostics needed to find the 401.
- auto_start could never fire, because the store's defaults always supplied
  auto: False for the fallback to find.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016NckgXecasQb2eSsPYNSW6

goodwe_controller/Dockerfile

@@ -3,14 +3,13 @@ FROM ${BUILD_FROM}
 
 ENV LANG=C.UTF-8 PYTHONUNBUFFERED=1 PYTHONDONTWRITEBYTECODE=1
 
-RUN apk add --no-cache python3 py3-pip
+# ⚠️ Install the dependencies from APK, not pip. Alpine ships musl, and there are
+# no musl wheels for aiohttp on PyPI - pip would compile it from source on the
+# client's Raspberry Pi, which needs a toolchain we would then have to ship and
+# takes many minutes. apk has prebuilt packages for both.
+RUN apk add --no-cache python3 py3-aiohttp py3-paho-mqtt
 
 WORKDIR /opt/goodwe
-COPY requirements.txt ./
-# --break-system-packages: Alpine marks its python "externally managed" (PEP 668).
-# This is a single-purpose container, so there is no environment to protect and a
-# venv would only add a layer and a PATH to get wrong.
-RUN pip3 install --no-cache-dir --break-system-packages -r requirements.txt
 
 COPY app/ ./app/
 COPY run.sh /run.sh