A07: Fix _auto_publish to allow fish name fallback without external_id

Bug: 'observation.fish_external_id is None' in early return prevented
auto-publishing observations that only have fish_name (no external_id),
even when name-based fallback matching was available.

Fix:
- Removed fish_external_id check from early return condition
- Auto-publish now tries external_id first, falls back to name match
- review_note now describes actual matching method:
  'Auto-matched: fish via external_id/name, waterbody via external_id/name'
- Previous note 'Automatically matched by previously reviewed source aliases'
  was misleading when name fallback was used

Verification:
- 14/14 community_importer tests pass
- 124/124 Python tests pass (1 skipped)
- Observations without fish_external_id can now auto-publish via name match
- review_note accurately describes matching method

apps/api/app/community_importer.py

@@ -106,7 +106,6 @@ def _auto_publish(session: Session, observation: ExternalObservation) -> bool:
         or
         observation.status not in {"staged", "mapped", "ready"}
         or not observation.source.enabled
-        or observation.fish_external_id is None
         or observation.x is None
         or observation.y is None
         or observation.weight_g is None
@@ -149,7 +148,10 @@ def _auto_publish(session: Session, observation: ExternalObservation) -> bool:
     observation.fish = fish
     observation.waterbody = waterbody
     observation.status = "ready"
-    observation.review_note = "Automatically matched by previously reviewed source aliases"
+    # A07: Describe actual matching method used
+    fish_method = "external_id" if observation.fish_external_id else "name"
+    wb_method = "external_id" if observation.waterbody_external_id else "name"
+    observation.review_note = f"Auto-matched: fish via {fish_method}, waterbody via {wb_method}"
     publish_observation(session, observation)
     return True