Freegle / Iznik / 22805

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fix(spatial): let admin upsert seed an index when none is loaded

The empty-index guard (never serve a 0-row index) left state.idx nil whenever
the startup build produced no rows — e.g. an empty test database. The admin
upsert endpoint is the integration-test seeding path (decoupled from the MySQL
rebuild by design), but it went through withIndex and so returned 503 'dataset
not ready', breaking all 13 Tests\Feature\Newsfeed\SendDigestCommandTest cases
that seed geometry via upsert.

ensureIndex() lazily creates an empty in-memory index for the upsert path: the
seed populates it immediately, so KNN never sees a 0-row index this way, and the
production rebuild/startupLoad guards that refuse to SERVE an empty MySQL-built
index are untouched. In-memory keeps it off disk so a later startupLoad can't
adopt it and it can't race a rebuild's file rename.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BwCp1yQaenemddKcqQBkTM

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