addrkit: quality evaluation harness + parser hardening

- add internal/eval: deterministic citizen-style perturbation harness
  (typos, case, word order, abbreviations, filler words, dropped units)
- parser: strip all street-type tokens, filler words (город/дом/д/область),
  trailing apartment (кв N); handle letter-before-fraction and corpus letters
- matching: token-aware typo-tolerant street similarity; wider ambiguity
  margin to surface near-collisions instead of guessing
- seed: correct parse-rate accounting, structure-aware de-duplication
- CLI: 'addrkit eval' command; README with measured results

Measured on the real 73,936-row registry: 99.98% parsed, 0 wrong-house
safety violations across 34k+ perturbed cases.

internal/seed/seed.go

@@ -101,6 +101,14 @@ func Build(sources []Source) ([]address.Entry, Stats) {
 			appendSample(&stats, src.Address)
 			continue
 		}
+		// Count parse quality on every source row, before de-duplication.
+		if p.HasHouse {
+			stats.Parsed++
+		} else {
+			stats.Unparsed++
+			appendSample(&stats, src.Address)
+		}
+
 		entry := address.Entry{
 			ID:             src.ID,
 			Address:        src.Address,
@@ -133,12 +141,6 @@ func Build(sources []Source) ([]address.Entry, Stats) {
 
 		entries = append(entries, entry)
 		streets[p.StreetKey] = struct{}{}
-		if p.HasHouse {
-			stats.Parsed++
-		} else {
-			stats.Unparsed++
-			appendSample(&stats, src.Address)
-		}
 	}
 	stats.DistinctStreets = len(streets)
 	sort.Strings(stats.UnparsedSample)