feat(web): route turns through runtime bridge

fixtures/runtime-state/initial.json

@@ -0,0 +1,56 @@
+{
+  "story_id": "story_nana_demo",
+  "current_node": "node_001",
+  "current_branch": "branch_main",
+  "world_flags": {},
+  "relationships": {
+    "nana->player": {
+      "affinity": 48,
+      "trust": 34,
+      "hope": 31,
+      "respect": 45,
+      "intimacy": 26,
+      "attachment": 42
+    }
+  },
+  "relationship_states": [],
+  "promises": [],
+  "knowledge": [
+    {
+      "id": "knowledge_station_clock",
+      "observer": "player",
+      "subject": "old_station_platform",
+      "fact": "站钟停在四点十七分，似乎并非自然损坏。",
+      "certainty": "confirmed",
+      "source": "玩家进入站台时亲眼观察",
+      "learned_at": "node_001",
+      "last_verified_at": "node_001"
+    }
+  ],
+  "items": [
+    {
+      "id": "item_flashlight_001",
+      "spec_ref": "nana.item.old_flashlight",
+      "owner": "player",
+      "holder": "player",
+      "placement": "bag",
+      "quantity": 1,
+      "condition": "worn",
+      "state_tags": [],
+      "acquisition": {
+        "mode": "initial",
+        "from": null,
+        "at_node": "node_001"
+      }
+    }
+  ],
+  "clocks": [
+    {
+      "id": "clock_dawn",
+      "label": "天亮逼近",
+      "value": 0,
+      "max": 6
+    }
+  ],
+  "checks": []
+}