fix(outages): parse portal address at the boundary; strip district suffix

The outages portal appends the district in parentheses, e.g.
"Медкадры улица, 1 (Заельцовский район)". That suffix hid the house number
from the parser, so every portal address failed house matching and /v1/outages
always returned empty.

- address: NormalizeText drops a trailing "(...)" group (root fix, benefits
  every source)
- outages: introduce HouseUnit; the ArcGIS adapter parses the (cleaned) address
  at the boundary and stores the structured unit; MatchingHouse matches on the
  unit (with a parse fallback for sources that only provide text)
- config: portal.url is now optional (core runs without the events module)
- httpapi: always return "outages": [] (no more omitempty); report
  "detail" when the events module is not configured
- tests: regression coverage for the portal district format

cmd/addrkitd/main.go

@@ -23,6 +23,7 @@ import (
 	"git.totmin.ru/en2zmax/addrkit/internal/adapters/registrystore"
 	"git.totmin.ru/en2zmax/addrkit/internal/config"
 	"git.totmin.ru/en2zmax/addrkit/internal/domain/match"
+	"git.totmin.ru/en2zmax/addrkit/internal/domain/outages"
 )
 
 func main() {
@@ -58,11 +59,18 @@ func main() {
 	}
 	resolver := match.NewResolver(index, rewriter)
 
-	portal := arcgis.New(
-		cfg.Portal.URL,
-		time.Duration(cfg.Portal.TimeoutSeconds)*time.Second,
-		cfg.Portal.Retries,
-	)
+	var portal outages.Source
+	if cfg.Portal.URL != "" {
+		portal = arcgis.New(
+			cfg.Portal.URL,
+			time.Duration(cfg.Portal.TimeoutSeconds)*time.Second,
+			cfg.Portal.Retries,
+		)
+		logger.Info("outages module enabled", "url", cfg.Portal.URL)
+	} else {
+		// portal.url is optional: without it only /v1/resolve is served.
+		logger.Info("outages module disabled (portal.url not set)")
+	}
 
 	loc := operationalLocation()
 	srv := httpapi.New(resolver, portal, logger, loc)