fix(address): normalize SECTORUL + etaj in addr_match, fix Oracle duplicate addrs

- _addr_match / addrMatch: add SECTORUL\s*\d* branch to strip sector
  number; add (?:\b|(?=\d)) to catch glued keywords (sc1, ap94);
  include etaj field in rStreet concat
- database.py: replace duplicate addr_match impl with import from sync_service
- import_service.py: short-circuit billing addr Oracle call when
  billing == shipping (avoids duplicate address creation)
- PL/SQL: normalize MUNICIPIUL BUCURESTI → BUCURESTI SECTORUL X before
  TIER 1; resolve id_localitate before search; TIER 1 now matches on
  id_loc instead of text locality
- Add scripts/cleanup_duplicate_addresses.sql for manual prod cleanup
- Add 5 new tests: sectorul, keyword+digit gluing, etaj, short-circuit

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

api/app/static/js/shared.js

@@ -850,11 +850,11 @@ function addrMatch(gomag, roa) {
     function norm(s) {
         return (s || '').normalize('NFD').replace(/[\u0300-\u036f]/g, '')
                         .toUpperCase()
-                        .replace(/\b(STR|STRADA|NR|NUMAR|NUMARUL|BL|BLOC|SC|SCARA|AP|APART|APARTAMENT|ET|ETAJ|COM|COMUNA|SAT|MUN|MUNICIPIUL|JUD|JUDETUL|CARTIER|PARTER|SECTOR|ORAS)\b/g, '')
+                        .replace(/\b(STR|STRADA|NR|NUMAR|NUMARUL|BL|BLOC|SC|SCARA|AP|APART|APARTAMENT|ET|ETAJ|COM|COMUNA|SAT|MUN|MUNICIPIUL|JUD|JUDETUL|CARTIER|PARTER|SECTOR|SECTORUL|ORAS)(?:\b|(?=\d))/g, '')
                         .replace(/[^A-Z0-9]/g, '');
     }
     const gStreet = norm(gomag.address || gomag.strada || '');
-    const rStreet = norm((roa.strada||'') + (roa.numar||'') + (roa.bloc||'') + (roa.scara||'') + (roa.apart||''));
+    const rStreet = norm((roa.strada||'') + (roa.numar||'') + (roa.bloc||'') + (roa.scara||'') + (roa.apart||'') + (roa.etaj||''));
     const gCity   = norm(gomag.city || gomag.localitate || '');
     const rCity   = norm(roa.localitate || '');
     const gRegion = norm(gomag.region || gomag.judet || '');