recon: add /api/wiki-enrich endpoint (extraction #5 prep, additive) (#8)

HTTP wrapper over the wiki_index lookup so the (future) navi-places service can
fetch wiki enrichment over HTTP instead of reading recon's 2.1 GB
data/wiki_index.db directly (Phase A option B — HTTP coupling).

  GET /api/wiki-enrich?wikidata=<Qid>           (primary key)
  GET /api/wiki-enrich?name=<name>&country=<cc>  (fallback key)
  -> 200 {wiki_summary?, wiki_population?, wiki_url?, wikivoyage_url?}
  -> 400 if no usable key; 404 on no match. Public (no auth, like /api/place/*).

Route keys are wikidata_id / name+country — NOT osm_type/osm_id — because that
is how wiki_index is actually queried (the in-process _enrich_with_wiki_index
looks up by result['wikidata_id'] then name+country_code, never by OSM id; see
extraction-5-wiki-enrich-investigation.md). An osm-keyed route would have forced
a redundant in-recon place lookup.

Changes (additive only):
  - lib/place_detail.py: new standalone lookup_wiki_index(wikidata_id, name,
    country_code) doing the same two SELECTs + field/URL mapping as the
    in-process path, returning a dict or None. Pure DB read, never raises.
    `_enrich_with_wiki_index` is LEFT UNTOUCHED — it can be DRY-refactored to
    delegate to this in a later PR; the in-process enrichment path is unchanged.
  - lib/wiki_enrich_api.py: new wiki_enrich_bp blueprint with the route.
  - lib/api.py: register the blueprint (one block).
  - lib/wiki_enrich_api_test.py: 4 tests (hit-by-wikidata + decoded fields,
    no-match -> 404, name+country fallback, no-key -> 400) over an in-memory
    fixture DB; plain-assert style + __main__ runner (recon venv has no pytest).
    Verified green against recon's venv (flask 3.1.2).

Does NOT remove the in-process _enrich_with_wiki_index call from place_detail —
that happens in a later PR once navi-places is live and serving.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

lib/api.py

@@ -73,6 +73,10 @@ from .netsyms_api import netsyms_bp, geocode_bp
 app.register_blueprint(netsyms_bp)
 app.register_blueprint(geocode_bp)
 
+# ── Wiki-enrich Blueprint (extraction #5 prep — HTTP wrapper over wiki_index) ──
+from .wiki_enrich_api import wiki_enrich_bp
+app.register_blueprint(wiki_enrich_bp)
+
 
 
 # ── Navigation Constants ──