feat: add raw binary stream logging, foreground service support, and improved frame header validation

- Implement RawStreamLogger for binary datastream recording with .bin file output
- Add foreground service (BluetoothForegroundService) to maintain Bluetooth connection during background operation
- Enhance frame header detection with 27-byte lookahead validation to filter false AA 55 sequences in payload data
- Add raw data recording toggle in settings with persistent preference storage
- Refactor Main

.idea/deploymentTargetSelector.xml

@@ -4,6 +4,13 @@
     <selectionStates>
       <SelectionState runConfigName="app">
         <option name="selectionMode" value="DROPDOWN" />
+        <DropdownSelection timestamp="2026-06-11T23:19:12.913231474Z">
+          <Target type="DEFAULT_BOOT">
+            <handle>
+              <DeviceId pluginId="PhysicalDevice" identifier="serial=38021FDJG009WV" />
+            </handle>
+          </Target>
+        </DropdownSelection>
         <DialogSelection />
       </SelectionState>
     </selectionStates>