settings: add Exchange API tab for instance system settings.

Allow configuring perpetual API keys and live trading from Settings, reusing the existing env save API.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/env/env_ui_manifest.py

@@ -220,6 +220,27 @@ def ui_allowed_keys(exchange_key: str) -> frozenset[str]:
     return frozenset(keys)
 
 
+def build_exchange_api_group(
+    exchange_key: str,
+    example_path: str,
+    env_path: str,
+) -> dict[str, Any]:
+    """系统设置「交易所 API」专用:仅交易所与实盘字段."""
+    schema = _schema_field_map(example_path)
+    values = env_get_all(read_env_lines(env_path))
+    ex = (exchange_key or "").strip().lower()
+    live_fields = _EXCHANGE_LIVE_FIELDS.get(ex, _EXCHANGE_LIVE_FIELDS["okx"])
+    fields = [
+        _build_field(key, label, note, schema, values)
+        for key, label, note in live_fields
+    ]
+    return {
+        "title": "交易所 API",
+        "fields": fields,
+        "has_restart": any(f.get("restart_required") for f in fields),
+    }
+
+
 def build_env_ui_payload(
     exchange_key: str,
     example_path: str,