feat(species): expand catalog to ~1200 edible species from Wikidata

Grow the bundled species catalog from 14 hand-curated entries to ~1200
edible/cultivated species, internationalized in 13 languages (es, en, fr,
de, it, pt, ca, gl, eu, ar, zh, ja, ru — Latin + Arabic RTL + CJK + Cyrillic).

- Add a reproducible generator (tool/gen_species_catalog.dart) that queries
  Wikidata (CC0, no attribution burden) in two phases, filters out
  non-vernacular noise (author citations, ranks, initials) and applies a
  relevance floor, then merges hand-curated, authoritative core-crop data
  (tool/curated_overrides.json: names, family, viability_years). GBIF is used
  only as an identifier. The generated species.json (v3) is committed.
- Carry wikidata_qid and gbif_key through the parse/seed pipeline; the columns
  already existed, so no DB migration.
- Rewrite seedBundled to one read + one batch (was a SELECT per species on
  every startup — a real cost at ~1200 rows) and keep it idempotent with
  backfill of the new reference fields.
- Move species search filtering to SQL (LIKE) so a large catalog is not pulled
  into memory on every keystroke.
- Cover the generator transform, the generated asset, and the new fields with
  tests.

apps/app_seeds/tool/README.md

@@ -0,0 +1,56 @@
+# Species catalog generator
+
+Regenerates [`assets/catalog/species.json`](../assets/catalog/species.json) — the
+bundled, offline, multilingual catalog of edible / cultivated plant species the
+app seeds into the encrypted database at first run.
+
+```sh
+cd apps/app_seeds
+dart run tool/gen_species_catalog.dart        # writes species.json (version 3)
+dart run tool/gen_species_catalog.dart --dry  # prints stats, writes nothing
+```
+
+The generated JSON is **committed** to the repo — the app never queries the
+network for it (local-first, offline).
+
+## Sources & licensing
+
+- **Names** come only from **Wikidata** labels and aliases. Wikidata is **CC0**
+  (public domain), so the bundled data carries **no attribution burden** and is
+  clean for redistribution under the app's AGPL-3.0 license.
+- **`gbif_key`** links the [GBIF](https://www.gbif.org/) taxonomic backbone. It
+  is used **only as an identifier** (a fact, not copyrightable text) — no GBIF
+  vernacular text is bundled, so no CC-BY attribution is triggered.
+- **Curated core crops** (names, family and `viability_years`) live in
+  [`curated_overrides.json`](curated_overrides.json), hand-maintained. For a
+  listed species the curated common names **win** (placed first, never dropped)
+  and its family/viability override Wikidata; Wikidata still adds more languages.
+  A curated species is always kept even if it would miss the relevance floor.
+- **`viability_years`** (seed longevity) is **not** in Wikidata — it comes only
+  from the curated overrides (public-domain agricultural-extension figures).
+  Species without an entry simply get no age-based expiry warning.
+
+## What it does
+
+1. **Phase 1 — species list (SPARQL):** taxa with a binomial name that are a
+   *crop* (`P279* Q235352`), the source/ingredient of a *food*
+   (`P1672`/`P366`/reverse `P1582` → `P279* Q2095`), with scientific name
+   (`P225`) and GBIF key (`P846`).
+2. **Phase 2 — names + family:** `rdfs:label` (primary) + `skos:altLabel`
+   (aliases), batched over the species and filtered to the bundled languages;
+   the family is walked up `P171*` to the family-rank ancestor.
+3. **Transform (`buildCatalog`, pure & unit-tested):** dedup by scientific name;
+   drop non-vernacular noise (the binomial itself, author citations, `var.`/`×`
+   ranks, abbreviated initials); merge the curated overrides (authoritative,
+   first); require a real vernacular in **≥ 4 languages** as a relevance floor so
+   the long tail of obscure single-label taxa is dropped; sort; serialize.
+
+The current run yields **~1200 species** (`assets/catalog/species.json` ≈ 1.5 MB).
+
+## Bundled languages
+
+`es, en, fr, de, it, pt, ca, gl, eu, ar, zh, ja, ru` — a multilingual **seed**,
+not a ceiling (Latin + Arabic RTL + CJK + Cyrillic). Edit `kCatalogLanguages` in
+[`gen_species_catalog.dart`](gen_species_catalog.dart) to widen coverage, then
+regenerate. A species with no name in any bundled language is dropped (add its
+language rather than assuming es/en).