Add JoinQuant env browser login helper

tests/test_joinquant_plugin.py

@@ -14,6 +14,7 @@ from cli import cli
 from pipeline.common.schema import FILL_COLUMNS, PNL_COLUMNS, POSITION_COLUMNS
 from plugins.joinquant.browser import (
     default_browser_config,
+    load_env_file,
     resolve_template,
     write_browser_config_template,
 )
@@ -559,6 +560,20 @@ def test_browser_config_template_and_placeholder_resolution(tmp_path):
     assert resolve_template("save:{expected_joinquant_csvs.fills}", context) == "save:/tmp/jq_fills.csv"
 
 
+def test_load_env_file_handles_quotes_without_shell_sourcing(tmp_path):
+    env_path = tmp_path / "joinquant.env"
+    env_path.write_text(
+        "JOINQUANT_USERNAME=alice\n"
+        "JOINQUANT_PASSWORD=\"secret\"\n"
+        "JOINQUANT_STRATEGY_URL='https://example.test/path?x=1&y=2'\n"
+    )
+
+    env = load_env_file(env_path)
+    assert env["JOINQUANT_USERNAME"] == "alice"
+    assert env["JOINQUANT_PASSWORD"] == "secret"
+    assert env["JOINQUANT_STRATEGY_URL"] == "https://example.test/path?x=1&y=2"
+
+
 def test_sim_trade_browser_config_template(tmp_path):
     config_path = write_browser_config_template(
         tmp_path / "sim_config.json",