feat: add CLI entry point with start/stop/status/config subcommands

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tests/test_cli.py

@@ -0,0 +1,48 @@
+import pytest
+from jianda_proxy.cli import build_parser
+
+
+class TestParser:
+    def test_start_subcommand_exists(self):
+        parser = build_parser()
+        args = parser.parse_args(["start"])
+        assert args.command == "start"
+        assert args.foreground is False
+
+    def test_start_foreground_flag(self):
+        parser = build_parser()
+        args = parser.parse_args(["start", "--foreground"])
+        assert args.foreground is True
+
+    def test_stop_subcommand(self):
+        parser = build_parser()
+        args = parser.parse_args(["stop"])
+        assert args.command == "stop"
+
+    def test_status_subcommand(self):
+        parser = build_parser()
+        args = parser.parse_args(["status"])
+        assert args.command == "status"
+
+    def test_config_set(self):
+        parser = build_parser()
+        args = parser.parse_args(["config", "set", "listen_port", "8080"])
+        assert args.config_command == "set"
+        assert args.key == "listen_port"
+        assert args.value == "8080"
+
+    def test_config_get(self):
+        parser = build_parser()
+        args = parser.parse_args(["config", "get", "listen_port"])
+        assert args.config_command == "get"
+        assert args.key == "listen_port"
+
+    def test_config_list(self):
+        parser = build_parser()
+        args = parser.parse_args(["config", "list"])
+        assert args.config_command == "list"
+
+    def test_config_path(self):
+        parser = build_parser()
+        args = parser.parse_args(["config", "path"])
+        assert args.config_command == "path"