refactor(addons): the transit-provider setting and photo-provider routes move into the shared kernel

AddonsService read the transit backend through transit/transit-provider.ts
and built photo-provider endpoint paths with memories.helpers, so the addons
domain, which nearly every domain imports for its gates, depended on
transit and memories. Both are free functions over a repository or plain
strings; they move unchanged to common/, where the transit and admin sides
read them too.

server/scripts/import-boundaries-baseline.json

@@ -3,44 +3,21 @@
   "domainCycles": [
     "accommodations -> assignments",
     "accommodations -> places",
-    "addons -> memories",
-    "addons -> transit",
     "assignments -> days",
-    "assignments -> journey",
-    "atlas -> addons",
     "auth -> plugins",
-    "budget -> addons",
     "days -> accommodations",
     "days -> assignments",
     "days -> places",
     "geo -> maps",
-    "integrations -> addons",
-    "integrations -> assignments",
-    "integrations -> atlas",
-    "integrations -> journey",
-    "integrations -> places",
     "integrations -> reservations",
-    "journey -> addons",
-    "journey -> atlas",
-    "journey -> memories",
-    "journey -> photos",
     "maps -> geo",
-    "memories -> addons",
     "memories -> photos",
     "photos -> memories",
     "places -> accommodations",
     "places -> assignments",
-    "places -> atlas",
-    "places -> journey",
     "plugins -> trips",
     "plugins -> vacay",
-    "reservations -> accommodations",
-    "reservations -> assignments",
-    "reservations -> budget",
-    "reservations -> days",
     "reservations -> integrations",
-    "transit -> days",
-    "transit -> reservations",
     "trip-members -> auth",
     "trip-members -> trips",
     "trip-read-model -> trip-members",
@@ -57,11 +34,8 @@
     "nest/common/validate-route-guards.ts -> nest/public-api/api-token.guard.ts"
   ],
   "domainInternals": [
-    "addons -> memories/memories.helpers.ts",
     "addons -> settings/instance-api-keys.ts",
-    "addons -> transit/transit-provider.ts",
     "admin -> llm-parse/llm-config.ts",
-    "admin -> memories/memories.helpers.ts",
     "atlas -> geo/nominatim.client.ts",
     "atlas -> public-api/public-api-request.ts",
     "auth -> maps/maps.helpers.ts",