feat(inventory): photo-first drafts + on-device OCR (digitization R2+R4)

Lower the bulk-digitization cliff with two more routes on top of the
already-landed CSV import and "save and add another":

- Photo-first drafts (capture now, catalogue later): burst-capture
  photos (camera or multi-gallery) into unnamed draft varieties, shown
  in a "to catalogue" tray, hidden from the main list until named.
  Adds Variety.isDraft (schema), addDraftVariety/watchDrafts/nameDraft,
  the triage sheet and the inventory banner.
- On-device OCR label suggestion (Tesseract, offline, no Google): a
  "Suggest name from photo" button in the naming dialog behind a
  LabelTextExtractor interface (Tesseract on Android/iOS, no-op
  elsewhere). Reads the largest print via hOCR bounding boxes, drops
  boilerplate/low-confidence noise, preprocesses (grayscale, contrast,
  upscale) and sweeps rotations (0-315 deg) so tilted packets still
  read. Bundles tessdata_fast eng+spa; validated on-device against real
  packets. The photo is written to a temp file deleted immediately in a
  finally block (the plugin needs a path) - a bounded, documented
  exception to no-plaintext-at-rest.

This commit also carries the co-developed schema evolution v5 to v8 that
shares these files (organic flag, species viability years, crop
calendar, lot provenance/abundance/preservation format, condition
checks) plus their exports/migrations and i18n.

Tests: CSV/draft/OCR unit + widget + migration green in isolation.
Note: the full widget suite currently hangs (>10 min) - under investigation.

apps/app_seeds/lib/data/species_repository.dart

@@ -9,6 +9,7 @@ class SpeciesSeed {
     required this.scientificName,
     this.family,
     this.commonNames = const {},
+    this.viabilityYears,
   });
 
   final String scientificName;
@@ -16,6 +17,9 @@ class SpeciesSeed {
 
   /// language code → list of common names.
   final Map<String, List<String>> commonNames;
+
+  /// Typical seed longevity in years (bundled reference data); null if unknown.
+  final int? viabilityYears;
 }
 
 /// A catalog match surfaced to the UI (with a best common name for the locale).
@@ -47,7 +51,9 @@ class SpeciesRepository {
   final String nodeId;
 
   /// Idempotently inserts bundled species (keyed by scientific name). Safe to
-  /// call on every startup; existing entries are left untouched.
+  /// call on every startup. Existing rows keep their identity, but a bundled
+  /// row still missing [SpeciesSeed.viabilityYears] is backfilled — so the
+  /// reference data reaches installs seeded before the field was bundled.
   Future<void> seedBundled(List<SpeciesSeed> seeds) async {
     final stamp = Hlc.zero(nodeId).pack();
     await _db.transaction(() async {
@@ -56,7 +62,19 @@ class SpeciesRepository {
             await (_db.select(_db.species)
                   ..where((s) => s.scientificName.equals(seed.scientificName)))
                 .getSingleOrNull();
-        if (existing != null) continue;
+        if (existing != null) {
+          // Backfill bundled reference data added after the row was seeded.
+          if (existing.viabilityYears == null && seed.viabilityYears != null) {
+            await (_db.update(_db.species)
+                  ..where((s) => s.id.equals(existing.id)))
+                .write(
+                  SpeciesCompanion(
+                    viabilityYears: Value(seed.viabilityYears),
+                  ),
+                );
+          }
+          continue;
+        }
 
         final speciesId = idGen.newId();
         await _db
@@ -70,6 +88,7 @@ class SpeciesRepository {
                 scientificName: seed.scientificName,
                 family: Value(seed.family),
                 isBundled: const Value(true),
+                viabilityYears: Value(seed.viabilityYears),
               ),
             );