fix(apiv2): remove legacy web transport and URL leaks

Makefile

@@ -203,6 +203,7 @@ MIGRATION_LEDGER := contracts/api/v2/migration.json
 # dynamic_plugin_proxy override). Runs the whole internal/contractledger
 # package so this named step enforces everything the docs attribute to it.
 verify-migration-ledger:
+	@python3 scripts/apiv2-ledger/test_extract_consumers.py
 	@python3 scripts/apiv2-ledger/assign_sections.py --check $(MIGRATION_LEDGER) \
 		|| { echo "::error::$(MIGRATION_LEDGER) section assignments are stale; run scripts/apiv2-ledger/assign_sections.py"; exit 1; }
 	@go test -count=1 ./internal/contractledger/ \

contracts/api/v2/fixtures/get_system_info_ok.json

@@ -1,7 +1,7 @@
 {
   "server_version": "unavailable",
   "api_major": 2,
-  "contract_digest": "774f49bd02d1b9465b2591013242eeb2aa41042c5303108ffc3ab39fd27c64eb",
+  "contract_digest": "c0b75587b58389a1204620593d30869d0a2adb805287d97888167bce1cb220a9",
   "links": {
     "openapi": "/api/v2/openapi.json",
     "capabilities": "/api/v2/capabilities"

contracts/api/v2/fixtures/list_household_sessions_ok.json

@@ -15,7 +15,7 @@
       "episode_name": "Pilot",
       "season_number": 1,
       "episode_number": 3,
-      "poster_url": "/api/v1/images/poster/42",
+      "poster_url": "https://media.example/poster-42.jpg",
       "play_method": "transcode",
       "reporting_node": "node-3",
       "node_display_name": "Basement",
@@ -81,7 +81,7 @@
       "episode_name": "",
       "season_number": null,
       "episode_number": null,
-      "poster_url": "/api/v1/images/poster/7",
+      "poster_url": "https://media.example/poster-7.jpg",
       "play_method": "direct",
       "reporting_node": "api",
       "node_display_name": "",