docs update

api/docs/API_REFERENCE.md

@@ -1335,6 +1335,7 @@ The NPC API enables interaction with persistent NPCs. NPCs have personalities, k
     "name": "Grom Ironbeard",
     "role": "bartender",
     "location_id": "crossville_tavern",
+    "image_url": "/static/images/npcs/crossville/grom_ironbeard.png",
     "personality": {
       "traits": ["gruff", "observant", "secretly kind"],
       "speech_style": "Uses dwarven expressions, speaks in short sentences",
@@ -1469,14 +1470,16 @@ The NPC API enables interaction with persistent NPCs. NPCs have personalities, k
         "name": "Grom Ironbeard",
         "role": "bartender",
         "appearance": "Stout dwarf with a braided grey beard",
-        "tags": ["merchant", "quest_giver"]
+        "tags": ["merchant", "quest_giver"],
+        "image_url": "/static/images/npcs/crossville/grom_ironbeard.png"
       },
       {
         "npc_id": "npc_mira_swiftfoot",
         "name": "Mira Swiftfoot",
         "role": "traveling rogue",
         "appearance": "Lithe half-elf with sharp eyes",
-        "tags": ["information", "secret_keeper"]
+        "tags": ["information", "secret_keeper"],
+        "image_url": "/static/images/npcs/crossville/mira_swiftfoot.png"
       }
     ]
   }

api/docs/DATA_MODELS.md

@@ -347,6 +347,7 @@ npc_id: "npc_grom_001"
 name: "Grom Ironbeard"
 role: "bartender"
 location_id: "crossville_tavern"
+image_url: "/static/images/npcs/crossville/grom_ironbeard.png"
 personality:
   traits:
     - "gruff"