Tighten protocol; add /wake, callback types, and orientation

State model is now strictly wake/sleep, owned by the device:
- Local triggers: tap (toggle), idle timeout (sleep only).
- Remote triggers: POST /wake, POST /sleep. Scrypted decides why
  (doorbell, motion, person, schedule) — the device does not know.
- /frame is pure paint: 204 when awake, 409 when asleep, no implicit
  wake. Eliminates the race where an in-flight frame could re-wake a
  device that just slept on a tap.

Orientation:
- Configurable via /config; default portrait.
- Effective resolution: 480x800 portrait, 800x480 landscape.
- Scrypted must render at the effective resolution. Device does not
  rotate or scale JPEG content.
- Orientation flows through mDNS TXT, /health, IP/Loading screens.

Callbacks:
- Add `type` field carrying the cause: tap or timeout (forward-compat
  for swipes etc).
- Drop wall-clock timestamp (no RTC, no SNTP).

Other:
- Boot: configured device boots to sleep (backlight off).
- /health adds state, last_frame_ms_ago, frame counters, error
  counters, brightness, orientation, idle_timeout_ms.
- idle_timeout_ms: 0 disables; non-zero must be >= 5000; else 400.
- First-boot brightness default 80; apply gamma curve to PWM.
- Watchdog reboots hung tasks; recovers state from NVS.
- On-board status LED indicates network/config state.
- mDNS hostname-collision warning; ops notes.
- Idempotency table summarizing endpoint safety.
- Each viewport is bound 1:1 to a camera in Scrypted-side code.
- Reframe "no rendering engine" honestly as "no general-purpose UI
  framework"; IP and Loading screens are the only locally-drawn UI.

Doc sync: v2 implementation guide endpoints, modules, milestones,
acceptance criteria, error handling, and tests all updated to match.

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