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/app/__init__.py

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+import os
+from flask import Flask
+
+def create_app(state_dir=None, pages_dir=None):
+    app = Flask(__name__)
+    app.config["STATE_DIR"] = state_dir or os.environ.get("STATE_DIR", "/app/state")
+    app.config["PAGES_DIR"] = pages_dir or os.environ.get("PAGES_DIR", "/app/pages")
+    app.config["IMMICH_URL"] = os.environ.get("IMMICH_URL", "")
+    app.config["IMMICH_API_KEY"] = os.environ.get("IMMICH_API_KEY", "")
+
+    from .routes import albums, proxy, notes, nav
+    app.register_blueprint(albums.bp)
+    app.register_blueprint(proxy.bp)
+    app.register_blueprint(notes.bp)
+    app.register_blueprint(nav.bp)
+
+    @app.get("/health")
+    def health():
+        return {"ok": True}
+
+    return app

services/travel-memories/app/routes/albums.py

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+from flask import Blueprint
+
+bp = Blueprint("albums", __name__)

services/travel-memories/app/routes/nav.py

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+from flask import Blueprint
+
+bp = Blueprint("nav", __name__)

services/travel-memories/app/routes/notes.py

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+from flask import Blueprint
+
+bp = Blueprint("notes", __name__)

services/travel-memories/app/routes/proxy.py

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+from flask import Blueprint
+
+bp = Blueprint("proxy", __name__)