upstream drops id field which breaks opencode flow

remove hardcoded deduction (legacy code)

routstr/upstream/base.py

@@ -5,6 +5,7 @@ import hashlib
 import json
 import re
 import traceback
+import uuid
 from collections.abc import AsyncGenerator
 from typing import Mapping
 
@@ -521,9 +522,13 @@ class BaseUpstreamProvider:
                             if isinstance(obj, dict):
                                 if obj.get("model"):
                                     last_model_seen = str(obj.get("model"))
+
                                 if requested_model:
                                     obj["model"] = requested_model
 
+                                if "id" not in obj or not isinstance(obj["id"], str):
+                                    obj["id"] = f"chatcmpl-{uuid.uuid4()}"
+
                                 if isinstance(obj.get("usage"), dict):
                                     # Hold this chunk back to merge cost later
                                     usage_chunk_data = obj
@@ -663,6 +668,8 @@ class BaseUpstreamProvider:
 
             if requested_model:
                 response_json["model"] = requested_model
+            if "id" not in response_json or not isinstance(response_json["id"], str):
+                response_json["id"] = f"chatcmpl-{uuid.uuid4()}"
 
             cost_data = await adjust_payment_for_tokens(
                 key, response_json, session, deducted_max_cost
@@ -992,6 +999,8 @@ class BaseUpstreamProvider:
 
             if requested_model:
                 response_json["model"] = requested_model
+            if "id" not in response_json or not isinstance(response_json["id"], str):
+                response_json["id"] = f"chatcmpl-{uuid.uuid4()}"
 
             cost_data = await adjust_payment_for_tokens(
                 key, response_json, session, deducted_max_cost