fix: revert runtime Python to 3.13 in all Dockerfiles

Renovate PR #598 bumped the runtime image to Python 3.14 but left the
builder stage on Python 3.13. This causes ModuleNotFoundError because
the venv site-packages are under python3.13/ while the 3.14 runtime
looks under python3.14/. Revert all three Dockerfiles to matching 3.13.

Author: Sergey

Dockerfile

@@ -23,7 +23,7 @@ RUN --mount=type=cache,target=/root/.cache/uv \
     uv sync --locked --no-dev
 
 # --- Runtime stage: clean image without uv ---
-FROM python:3.14-slim-bookworm@sha256:f0540d0436a220db0a576ccfe75631ab072391e43a24b88972ef9833f699095f
+FROM python:3.13-slim-bookworm@sha256:8092ae2ef67061f9db412458dbdce44dbf16748fb3cae5cdbd020f467a9712d0
 
 LABEL org.opencontainers.image.title="Home Assistant MCP Server" \
       org.opencontainers.image.description="AI assistant integration for Home Assistant via Model Context Protocol" \

homeassistant-addon-dev/Dockerfile

@@ -22,7 +22,7 @@ RUN --mount=type=cache,target=/root/.cache/uv \
     uv sync --locked --no-dev --no-editable
 
 # --- Runtime stage: clean image without uv ---
-FROM python:3.14-slim-bookworm@sha256:f0540d0436a220db0a576ccfe75631ab072391e43a24b88972ef9833f699095f
+FROM python:3.13-slim-bookworm@sha256:8092ae2ef67061f9db412458dbdce44dbf16748fb3cae5cdbd020f467a9712d0
 
 WORKDIR /app