Initial commit - Phase 3/4

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/backend/managers/ups_drivers/base.py

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+"""Base class for UPS drivers."""
+from abc import ABC, abstractmethod
+from dataclasses import dataclass
+from typing import Optional
+
+
+@dataclass
+class UPSData:
+    """Battery data from UPS hardware."""
+    percentage: float  # 0-100%
+    voltage: float  # mV
+    current: float  # A (positive=charging, negative=discharging)
+    is_charging: bool
+    temperature: Optional[float] = None  # Celsius
+    time_remaining: Optional[int] = None  # Minutes
+
+
+class UPSDriver(ABC):
+    """Abstract base class for UPS hardware drivers."""
+
+    @abstractmethod
+    async def initialize(self) -> bool:
+        """Initialize connection to UPS hardware.
+
+        Returns:
+            True if initialization successful, False otherwise
+        """
+        pass
+
+    @abstractmethod
+    async def read_data(self) -> UPSData:
+        """Read current battery data from UPS.
+
+        Returns:
+            UPSData object with current readings
+        """
+        pass
+
+    @abstractmethod
+    async def is_available(self) -> bool:
+        """Check if UPS hardware is available.
+
+        Returns:
+            True if hardware is accessible, False otherwise
+        """
+        pass
+
+    @abstractmethod
+    def close(self):
+        """Close connection to UPS hardware."""
+        pass
+
+    @abstractmethod
+    def get_model_name(self) -> str:
+        """Get the UPS model/type name.
+
+        Returns:
+            Human-readable model name
+        """
+        pass