NetworkServer: reject SDK index == element count (off-by-one)

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The SDK LED/zone update handlers checked the client-supplied index with '>'
instead of '>=', so an index equal to the element count passed the check and
reached an out-of-bounds access:

- UpdateSingleLED: out-of-bounds write to colors[led_idx]
- UpdateZoneLEDs / UpdateZoneMode: out-of-bounds read/write on zones[zone_idx]

UpdateMode had the same off-by-one (currently harmless due to a later check),
fixed for consistency. The num_colors check stays '>' since num_colors ==
leds_count is a valid "all LEDs" request.

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500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f