fix(avatar): normalize embedding API endpoint

digital-avatar-app/backend/embeddings.py

@@ -18,6 +18,14 @@ EMBED_DIM = 256
 MODEL = os.getenv("EMBEDDING_MODEL", "mock-hash-embed-v1")
 
 
+def _embedding_endpoint(api_url):
+    """Accept either an OpenAI-compatible base URL or its full endpoint."""
+    api_url = (api_url or "").strip().rstrip("/")
+    if not api_url or api_url.endswith("/embeddings"):
+        return api_url
+    return f"{api_url}/embeddings"
+
+
 def _tokenize(text):
     text = (text or "").lower()
     # 英文/数字按词，CJK 逐字（中文无空格，需拆到字级才能命中子词）
@@ -47,7 +55,7 @@ def embed(texts):
     """返回 list[list[float]]，与输入顺序一致。"""
     if not texts:
         return []
-    api_url = os.getenv("EMBEDDING_API_URL")
+    api_url = _embedding_endpoint(os.getenv("EMBEDDING_API_URL"))
     if api_url:
         api_key = os.getenv("EMBEDDING_API_KEY", "")
         model = os.getenv("EMBEDDING_MODEL", "text-embedding-3-small")