fix: keep exchange API only in env config, remove from system settings.

EOF

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

lib/env/env_ui_manifest.py

@@ -258,27 +258,6 @@ 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,