fix: avatar list fixes — full-width table, absolute photo URLs, global token balance

- Table width set to 100%
- Photo URLs resolved to absolute paths using AVATAR_BACKEND_URL
- Token balance now reads from global token_account table
- Config: added AVATAR_BACKEND_URL setting

backend/app/services/avatar_service.py

@@ -44,6 +44,28 @@ def is_available() -> bool:
     return engine is not None
 
 
+def _resolve_photo_url(photo_url: str) -> str:
+    """将相对路径的头像 URL 补全为绝对路径"""
+    if not photo_url:
+        return ""
+    if photo_url.startswith(("http://", "https://")):
+        return photo_url
+    base = settings.AVATAR_BACKEND_URL
+    if base:
+        base = base.rstrip("/")
+        return f"{base}{photo_url}"
+    return photo_url
+
+
+def _get_global_token_balance(db: Session) -> int:
+    """获取全局 token_account 余额（单行表）"""
+    try:
+        result = db.execute(text("SELECT balance FROM token_account LIMIT 1")).fetchone()
+        return result.balance if result and result.balance else 0
+    except Exception:
+        return 0
+
+
 class AvatarService:
 
     @staticmethod
@@ -97,6 +119,7 @@ class AvatarService:
         rows = db.execute(query, params).fetchall()
 
         items = []
+        global_token = _get_global_token_balance(db)
         for row in rows:
             config = {}
             if row.config:
@@ -113,10 +136,10 @@ class AvatarService:
                 "name": row.name,
                 "display_name": row.display_name,
                 "description": row.description or "",
-                "photo_url": row.photo_url or "",
+                "photo_url": _resolve_photo_url(row.photo_url),
                 "emoji": row.emoji or "🤖",
                 "status": row.status or "active",
-                "token_balance": row.token_balance or 0,
+                "token_balance": global_token or (row.token_balance or 0),
                 "config": config,
                 "owner_nickname": row.owner_nickname or "",
                 "owner_phone": row.owner_phone or "",
@@ -155,15 +178,16 @@ class AvatarService:
             elif isinstance(row.config, dict):
                 config = row.config
 
+        global_token = _get_global_token_balance(db)
         return {
             "id": row.id,
             "name": row.name,
             "display_name": row.display_name,
             "description": row.description or "",
-            "photo_url": row.photo_url or "",
+            "photo_url": _resolve_photo_url(row.photo_url),
             "emoji": row.emoji or "🤖",
             "status": row.status or "active",
-            "token_balance": row.token_balance or 0,
+            "token_balance": global_token or (row.token_balance or 0),
             "config": config,
             "owner_nickname": row.owner_nickname or "",
             "owner_phone": row.owner_phone or "",