feat: login time window rules (EPIC_000014)

- Implemented RuleManager and JSON storage
- Added background enforcement scheduler
- Added Web UI for rule management at /ui/rules
- Bumped version to 0.3.0

tests/test_rules.py

@@ -0,0 +1,95 @@
+import unittest
+import os
+import tempfile
+from datetime import datetime
+from unittest.mock import patch
+
+# Adjust path if necessary, assuming run from project root
+from backend.models import AccessRule, TimeWindow, DayOfWeek
+from backend.rules import RuleManager
+
+class TestRules(unittest.TestCase):
+    def setUp(self):
+        self.tmp_fd, self.rules_file = tempfile.mkstemp()
+        os.close(self.tmp_fd)
+        
+    def tearDown(self):
+        if os.path.exists(self.rules_file):
+            os.remove(self.rules_file)
+
+    @patch("backend.rules.get_settings")
+    def test_load_save_rules(self, mock_settings):
+        mock_settings.return_value.rules_file = self.rules_file
+        manager = RuleManager()
+        
+        # Should be empty initially
+        rules = manager.load_rules()
+        self.assertEqual(rules.rules, {})
+
+        # Save a rule
+        rule = AccessRule(
+            user="testuser",
+            allowed_windows=[
+                TimeWindow(days=[DayOfWeek.MONDAY], start_time="09:00", end_time="17:00")
+            ]
+        )
+        manager.set_rule(rule)
+        
+        # Load back
+        loaded = manager.get_rule("testuser")
+        self.assertIsNotNone(loaded)
+        self.assertEqual(loaded.user, "testuser")
+        self.assertEqual(loaded.allowed_windows[0].start_time, "09:00")
+
+    @patch("backend.rules.get_settings")
+    def test_access_logic(self, mock_settings):
+        mock_settings.return_value.rules_file = self.rules_file
+        manager = RuleManager()
+
+        # No rule -> Allowed
+        self.assertTrue(manager.is_login_allowed("unknown"))
+
+        # Add rule: Mon 10-12
+        rule = AccessRule(
+            user="kid",
+            allowed_windows=[
+                TimeWindow(days=[DayOfWeek.MONDAY], start_time="10:00", end_time="12:00")
+            ]
+        )
+        manager.set_rule(rule)
+
+        # Monday 11:00 -> Allowed
+        # Jan 2 2023 is Monday
+        mon_11 = datetime(2023, 1, 2, 11, 0) 
+        self.assertTrue(manager.is_login_allowed("kid", mon_11))
+
+        # Monday 09:00 -> Denied
+        mon_09 = datetime(2023, 1, 2, 9, 0)
+        self.assertFalse(manager.is_login_allowed("kid", mon_09))
+
+        # Tuesday 11:00 -> Denied
+        # Jan 3 2023 is Tuesday
+        tue_11 = datetime(2023, 1, 3, 11, 0) 
+        self.assertFalse(manager.is_login_allowed("kid", tue_11))
+        
+    @patch("backend.rules.get_settings")
+    def test_disabled_rule(self, mock_settings):
+        mock_settings.return_value.rules_file = self.rules_file
+        manager = RuleManager()
+
+        # Add disabled rule
+        rule = AccessRule(
+            user="kid",
+            enabled=False,
+            allowed_windows=[
+                TimeWindow(days=[DayOfWeek.MONDAY], start_time="10:00", end_time="12:00")
+            ]
+        )
+        manager.set_rule(rule)
+
+        # Should be allowed even if time doesn't match, because rule is disabled (default allow)
+        mon_09 = datetime(2023, 1, 2, 9, 0)
+        self.assertTrue(manager.is_login_allowed("kid", mon_09))
+
+if __name__ == "__main__":
+    unittest.main()