Reorder milestones so Config Persistence comes before Frame/Wake/Sleep

Previously M5 (Wake/Sleep + idle timer) and M4 (Frame) implicitly
depended on NVS values (orientation, idle_timeout_ms) that did not
exist until M6 (Config Persistence). Moving Config to M4 lets the
downstream endpoints read their parameters from NVS instead of
working around hardcoded defaults.

New order:
  M1 Board Bring-Up
  M2 HTTP + mDNS
  M3 Display Bring-Up
  M4 Config Persistence  (was M6)
  M5 JPEG Frame Push     (was M4)
  M6 Wake/Sleep/Brightness (was M5)
  M7 Touch Callback
  M8 Local Screens + BOOT button
  M9 Live Stream (/stream)

M4 now also validates orientation and idle_timeout_ms per spec,
applies orientation immediately (mDNS TXT + /health reflect it), and
establishes the brightness default (80) on first boot. M5's test
image is 480x800 by default (portrait); switch to 800x480 if /config
sets landscape. M6's idle timer reads idle_timeout_ms from NVS.

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