feat(store): fetch contributions incrementally and persist history in SQLite

Bound each provider's startFetch()/resolveFetch() to an optional
since/until window, wire a SQLite-backed ContributionStore into
ContributionAggregator (fetch only the trailing window past the last
stored date, merge into the store, prune by CONTRIBUTIONS_RETENTION_DAYS),
and add a graph:contributions:refetch command to force a full or ranged
re-fetch in <=365-day chunks. This is the root fix for the full
365-day-refetch timeout that used to hit on every cache miss.

Dockerfile

@@ -49,7 +49,7 @@ COPY --link docker/frankenphp/Caddyfile /etc/caddy/Caddyfile
 COPY --link docker/php/conf.d/20-app.prod.ini $PHP_INI_DIR/app.conf.d/
 
 RUN chmod +x bin/console && \
-    mkdir -p var/cache/prod/pools var/log /config/caddy /data/caddy && \
+    mkdir -p var/cache/prod/pools var/log var/data /config/caddy /data/caddy && \
     chown -R app:app /app /config /data
 
 USER app