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

backend/models.py

@@ -1,8 +1,36 @@
-from typing import List, Optional
+from enum import Enum
+from typing import List, Optional, Dict
 
 from pydantic import BaseModel, Field
 
 
+class DayOfWeek(str, Enum):
+    MONDAY = "mon"
+    TUESDAY = "tue"
+    WEDNESDAY = "wed"
+    THURSDAY = "thu"
+    FRIDAY = "fri"
+    SATURDAY = "sat"
+    SUNDAY = "sun"
+
+
+class TimeWindow(BaseModel):
+    days: List[DayOfWeek]
+    start_time: str = Field(..., pattern=r"^\d{2}:\d{2}$", description="HH:MM format")
+    end_time: str = Field(..., pattern=r"^\d{2}:\d{2}$", description="HH:MM format")
+
+
+class AccessRule(BaseModel):
+    user: str
+    enabled: bool = True
+    auto_reenable: bool = False
+    allowed_windows: List[TimeWindow] = []
+
+
+class RuleSet(BaseModel):
+    rules: Dict[str, AccessRule] = {}  # Keyed by username for O(1) lookup
+
+
 class ActionRequest(BaseModel):
     countdown: Optional[int] = Field(default=None, ge=0, description="Seconds for countdown")
     sound: Optional[bool] = Field(default=None, description="Play sound alongside notification")