fix(aimlapi): send attribution headers on every aimlapi.com request (#17491)

### Summary

The **aimlapi.com** provider added in #17311 does not identify itself on
any of its outgoing requests, so its traffic cannot be attributed to the
integration. This PR adds the two headers AIMLAPI expects —
`X-AIMLAPI-Source` and `X-AIMLAPI-Partner-ID` — to every request the
provider makes.

common/aimlapi_utils.py

@@ -0,0 +1,49 @@
+#
+#  Copyright 2026 The InfiniFlow Authors. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+"""Shared request attribution for the aimlapi.com provider.
+
+Every call RAGFlow makes to AIMLAPI — chat, embeddings, vision, the model
+catalog and the agent-authorization endpoints — carries the same two headers:
+they tell AIMLAPI which client the traffic comes from and which integration it
+belongs to. The same client identifier also rides on the consent URL, where a
+header cannot reach (the account is created in a browser AIMLAPI controls).
+Defaults are RAGFlow's own; both are overridable via environment:
+
+  AIMLAPI_SOURCE       client identifier (default ``agent/ragflow``)
+  AIMLAPI_PARTNER_ID   integration id (defaults to RAGFlow's)
+"""
+
+import os
+
+DEFAULT_SOURCE = "agent/ragflow"
+DEFAULT_PARTNER_ID = "part_yNkcOvbGLtgxWLjy4sRysaer"
+
+
+def source() -> str:
+    return os.environ.get("AIMLAPI_SOURCE", DEFAULT_SOURCE).strip()
+
+
+def partner_id() -> str:
+    return os.environ.get("AIMLAPI_PARTNER_ID", DEFAULT_PARTNER_ID).strip()
+
+
+def attribution_headers() -> dict:
+    """Headers to send on every request to aimlapi.com."""
+    headers = {"X-AIMLAPI-Source": source()}
+    pid = partner_id()
+    if pid:
+        headers["X-AIMLAPI-Partner-ID"] = pid
+    return headers