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

internal/adapters/arcgis/client.go

@@ -15,13 +15,26 @@ import (
 	"io"
 	"net/http"
 	"net/url"
+	"regexp"
 	"strconv"
 	"strings"
 	"time"
 
+	"git.totmin.ru/en2zmax/addrkit/internal/domain/address"
 	"git.totmin.ru/en2zmax/addrkit/internal/domain/outages"
 )
 
+// reDistrictSuffix matches the administrative suffix the portal appends to its
+// display address, e.g. "Медкадры улица, 1 (Заельцовский район)". It must be
+// removed before the address is parsed, otherwise the trailing district text
+// hides the house number. The district is available separately as a field.
+var reDistrictSuffix = regexp.MustCompile(`\s*\([^)]*\)\s*$`)
+
+// cleanAddress strips the portal's district suffix and surrounding spaces.
+func cleanAddress(s string) string {
+	return strings.TrimSpace(reDistrictSuffix.ReplaceAllString(s, ""))
+}
+
 // Client is a bounded HTTP client for the portal.
 type Client struct {
 	baseURL string
@@ -127,8 +140,9 @@ func parseResponse(body []byte) ([]outages.Outage, error) {
 
 	out := make([]outages.Outage, 0, len(pr.Features))
 	for _, feat := range pr.Features {
+		addr := cleanAddress(addressOf(feat.Attributes, feat.Value))
 		o := outages.Outage{
-			Address:   addressOf(feat.Attributes, feat.Value),
+			Address:   addr,
 			Type:      lookup(maps, "type_id", feat.Attributes),
 			System:    lookup(maps, "system_id", feat.Attributes),
 			Time:      lookup(maps, "time_category", feat.Attributes),
@@ -136,6 +150,9 @@ func parseResponse(body []byte) ([]outages.Outage, error) {
 			EndDate:   stringOf(feat.Attributes["end_date"]),
 		}
 		o.Action = actionFor(o.System)
+		// Parse the address at the boundary so the domain matches on structure
+		// and never depends on this portal's text format.
+		o.Unit = outages.HouseUnitOf(address.Parse(addr))
 		out = append(out, o)
 	}
 	return out, nil