build: add pyinstaller packaging

tests/test_packaging.py

@@ -0,0 +1,48 @@
+import unittest
+
+from _helpers import REPO_ROOT
+
+
+class PackagingTests(unittest.TestCase):
+    def read_text(self, relative_path):
+        return (REPO_ROOT / relative_path).read_text(encoding="utf-8")
+
+    def test_frozen_entrypoint_uses_exe_directory(self):
+        main_py = self.read_text("main.py")
+
+        self.assertIn('getattr(sys, "frozen", False)', main_py)
+        self.assertIn("sys.executable", main_py)
+        self.assertIn("os.chdir(PROJECT_ROOT)", main_py)
+
+    def test_pyinstaller_spec_uses_onedir_without_local_datas(self):
+        spec = self.read_text("cmshopee.spec")
+        normalized = "".join(spec.split())
+
+        self.assertIn("datas=[]", normalized)
+        self.assertIn("COLLECT(", spec)
+        self.assertIn('name="cmshopee"', normalized)
+
+    def test_build_script_blocks_user_data_in_release_output(self):
+        script = self.read_text("scripts/build_exe.ps1")
+
+        for token in (
+            "config.json",
+            "config\\ai_models.json",
+            "cmshopee.db",
+            "cmshopee.db-wal",
+            "cmshopee.db-shm",
+            "db.sqlite",
+            "chrome_user_data_dir",
+            "images",
+            "logs",
+            "prompts",
+            "title_prompt.txt",
+        ):
+            self.assertIn(token, script)
+
+        self.assertIn("python -m PyInstaller --noconfirm --clean", script)
+        self.assertIn("cmshopee.spec", script)
+
+
+if __name__ == "__main__":
+    unittest.main()