Reduce location resource usage: economy mode by default, lifecycle throttling

- Start LocationService at ECONOMY (5 s, PRIORITY_BALANCED_POWER_ACCURACY)
  instead of FULL (1 Hz, PRIORITY_HIGH_ACCURACY); promote to FULL only
  while a track is actively recording and demote back when recording stops
- Use PRIORITY_BALANCED_POWER_ACCURACY for ECONOMY and ANCHOR_WATCH modes
  so the GPS chip idles and network/passive sources handle light-duty fixes
- Add ACTION_START_ECONOMY / ACTION_START_FULL intents so MainActivity can
  drive mode transitions from lifecycle callbacks
- onPause: drop to ECONOMY if not recording or anchor-watching; onResume:
  restore the appropriate mode so the first visible frame has a fresh rate
- Stop-anchor-watch now returns to ECONOMY instead of FULL (anchor drop
  rarely coincides with active track recording)
- Remove ACCESS_BACKGROUND_LOCATION from manifest — the foreground service
  with foregroundServiceType="location" already covers background access
- Add 5 m minimum-distance filter to DeviceGpsProvider so stationary devices
  don't generate spurious location callbacks

https://claude.ai/code/session_01YUbuZNDAoLea4cf9UGQ9qn

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