Add EDDM size, income, businesses and USPS map link (#14)

## Summary
Closes #13.

- Mirror Monica: join USPS EDDM GIS stats onto the carrier-route picker (household size, median income, business count).
- Add Open USPS EDDM map link next to Find routes.
- GIS miss stays a dash and does not block Find routes. PCM households and cost unchanged.

Monica: ai_ml_operations/monica_site#17

## Test plan
- [ ] Find routes for a ZIP; table shows Size / Income / Businesses columns
- [ ] Missing GIS values render as —
- [ ] Open USPS EDDM map opens eddm.usps.com
- [ ] Quote and 1–2 route send still work
- [ ] `CarrierRoutePostcardTests` pass

Reviewed-on: #14

site/directmail/tests.py

@@ -304,13 +304,15 @@ class PostcardUtmPanelTests(TestCase):
         self.assertContains(response, "qrcode.min.js")
         self.assertContains(response, "data-utm-qr")
         self.assertContains(response, reverse("campaign_short_link"))
+        self.assertContains(response, "https://eddm.usps.com/eddm/select-routes.htm")
+        self.assertContains(response, "Open USPS EDDM map")
 
 
 class CarrierRoutePostcardTests(TestCase):
     def setUp(self):
         User = get_user_model()
         self.user = User.objects.create_user(
-            username="routes", password="test-pass-123"
+            username="routes", password="test-pass-123", is_staff=True
         )
         self.client = Client()
         self.client.login(username="routes", password="test-pass-123")
@@ -318,6 +320,12 @@ class CarrierRoutePostcardTests(TestCase):
             email="mail@example.com",
             postal_address=Contact.make_postal_address(line1="9 Main"),
         )
+        self.eddm_patcher = patch(
+            "directmail.providers.postcard.usps_eddm.fetch_eddm_route_stats",
+            return_value={},
+        )
+        self.eddm_stats = self.eddm_patcher.start()
+        self.addCleanup(self.eddm_patcher.stop)
 
     def test_pick_unit_price_uses_break_qty_and_fallback(self):
         from directmail.providers.postcard import pcm as pcm_mod
@@ -371,6 +379,49 @@ class CarrierRoutePostcardTests(TestCase):
         self.assertEqual(len(data["routes"]), 2)
         self.assertEqual(data["routes"][0]["cost"], 60.0)
         self.assertEqual(data["mail_class"], "Standard")
+        self.assertEqual(
+            data["eddm_map_url"], "https://eddm.usps.com/eddm/select-routes.htm"
+        )
+
+    def test_quote_search_includes_eddm_demographics(self):
+        self.eddm_stats.return_value = {
+            "60540:C001": {
+                "businesses": 22,
+                "household_size": 2.6,
+                "median_income": 120000,
+                "residential": 108,
+            }
+        }
+        payload = {
+            "listCountID": 11,
+            "recordCount": 120,
+            "breakdown": [
+                {
+                    "breakdownType": "ZipCRRT",
+                    "data": [
+                        {"code": "60540:C001", "text": "NAPERVILLE", "total": 120},
+                    ],
+                }
+            ],
+        }
+        with self.settings(PCM_POSTCARD_PRICE_STANDARD="0.50"):
+            with patch(
+                "directmail.providers.postcard.pcm.design_pricing", return_value=[]
+            ):
+                with patch(
+                    "directmail.providers.postcard.pcm.list_count_zipcode",
+                    return_value=payload,
+                ):
+                    response = self.client.post(
+                        reverse("directmail:postcard_quote"),
+                        data='{"action":"search","zip":"60540","size":"68"}',
+                        content_type="application/json",
+                    )
+        self.assertEqual(response.status_code, 200)
+        row = response.json()["routes"][0]
+        self.assertEqual(row["businesses"], 22)
+        self.assertEqual(row["household_size"], 2.6)
+        self.assertEqual(row["median_income"], 120000)
 
     def test_quote_select_and_save_draft(self):
         import json