feat: scaffold travel-memories Flask app and test infrastructure

Adds services/travel-memories/ with Flask factory (create_app), stub
route blueprints, pytest/playwright smoke test infra (httpserver session
fix, pytest.ini pythonpath), phase2–6 fixture JSONs, Dockerfile, and
docker-compose service entry. Smoke test (test_health) passes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

services/travel-memories/Dockerfile

@@ -0,0 +1,10 @@
+FROM python:3.12-slim
+WORKDIR /app
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt && \
+    playwright install chromium --with-deps
+COPY app/ ./app/
+ENV FLASK_APP=app
+ENV FLASK_RUN_HOST=0.0.0.0
+ENV FLASK_RUN_PORT=8082
+CMD ["flask", "run"]