A brand-new pet with zero posts of its own and no followees with posts
saw a completely empty feed on first visit. Instead of that dead-feeling
first impression, getFeed now falls back to recent posts from other pets
of the same species, ranked by the existing algoScore (engagement +
recency) — same idea as a "For You" feed, scoped by species instead of
follows.
Only kicks in on the first page (no cursor) of the primary Redis-backed
path, so paginating an already-empty follow feed doesn't keep serving
discovery pages. Response carries a `source: "following" | "discovery"`
flag; FeedList shows a small dismissless banner explaining the posts
aren't from follows yet, otherwise the feed renders identically
(WelcomeCard, feed-mode toggle, PostCard list all unchanged).
Added 2 regression tests covering the discovery-fallback trigger and
the "don't discovery-fallback while paginating" edge case.
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