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/place_detail.py

@@ -307,6 +307,70 @@ def _get_wiki_index_db():
     return _wiki_index_conn
 
 
+def lookup_wiki_index(wikidata_id=None, name=None, country_code=None):
+    """Standalone wiki_index lookup, extracted for the /api/wiki-enrich endpoint
+    (extraction #5: navi-places HTTP-fetches wiki enrichment instead of reading
+    the 2.1 GB wiki_index.db directly).
+
+    Mirrors the lookup that `_enrich_with_wiki_index` performs in-process:
+    by wikidata_id first, then a name + country_code fallback. Returns a dict of
+    wiki enrichment fields (only those present), or None if there is no match or
+    the wiki_index DB is unavailable. Pure DB read — no feature-flag gating
+    (callers decide whether to call) and never raises.
+
+    NOTE: additive only — `_enrich_with_wiki_index` is intentionally left
+    untouched here; it can be DRY-refactored to delegate to this in a later PR.
+    """
+    db = _get_wiki_index_db()
+    if not db:
+        return None
+
+    try:
+        cur = db.cursor()
+        row = None
+
+        if wikidata_id:
+            wid = wikidata_id
+            if isinstance(wid, str) and wid.startswith("http"):
+                wid = wid.split("/")[-1]
+            cur.execute(
+                "SELECT summary, wiki_population, wikipedia_title, wikivoyage_title FROM wiki_places WHERE wikidata_id = ?",
+                (wid,)
+            )
+            row = cur.fetchone()
+
+        if not row and name and country_code:
+            cur.execute(
+                "SELECT summary, wiki_population, wikipedia_title, wikivoyage_title FROM wiki_places WHERE place_name = ? AND country_code = ? LIMIT 1",
+                (name, country_code.lower())
+            )
+            row = cur.fetchone()
+
+        if not row:
+            return None
+
+        out = {}
+        if row["summary"]:
+            out["wiki_summary"] = row["summary"]
+        if row["wiki_population"]:
+            try:
+                out["wiki_population"] = int(row["wiki_population"])
+            except (ValueError, TypeError):
+                out["wiki_population"] = row["wiki_population"]
+        if row["wikipedia_title"]:
+            title = row["wikipedia_title"].replace(" ", "_")
+            out["wiki_url"] = f"https://en.wikipedia.org/wiki/{title}"
+        if row["wikivoyage_title"]:
+            title = row["wikivoyage_title"].replace(" ", "_")
+            out["wikivoyage_url"] = f"https://en.wikivoyage.org/wiki/{title}"
+
+        return out or None
+
+    except Exception as e:
+        logger.debug(f"wiki_index lookup error: {e}")
+        return None
+
+
 def _enrich_with_wiki_index(result):
     try:
         from .deployment_config import get_deployment_config