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/domain/address/parse_test.go

@@ -95,6 +95,12 @@ func TestParseHouseBlock(t *testing.T) {
 			wantName: "кошурникова", wantType: "улица",
 			wantHouse: "11", wantFrac: "1", wantHas: true,
 		},
+		{
+			name:     "portal district suffix in parentheses",
+			raw:      "Медкадры улица, 1 (Заельцовский район)",
+			wantName: "медкадры", wantType: "улица",
+			wantHouse: "1", wantHas: true,
+		},
 	}
 
 	for _, tt := range tests {
@@ -154,6 +160,7 @@ func TestNormalizeIdempotent(t *testing.T) {
 		"  2-Я  Станционная\u00a0улица 1/1 стр. ",
 		"ЁЛКИ  д. 5, кв. 3",
 		"СТАНИЦИОННАЯ — улица, 30а",
+		"Медкадры улица, 1 (Заельцовский район)",
 		"",
 	}
 	for _, in := range inputs {