camera: add user option to rotate the camera image 180 degrees

[cateim]

Description

Adds a persisted user setting to rotate the camera preview image 180 degrees, for boards whose camera module can be physically mounted either way up. This supersedes #331, which flipped the build-time default for the Waveshare S3 Touch LCD 2.

Root Cause / Context

• Two Waveshare S3 Touch LCD 2 units with the same OV5640 module produce opposite preview orientations (see diy: fix upside down camera image on Waveshare Touch LCD 2 #331), so no build-time default suits both.
• Both modules identify as CAMERA_OV5640 over I2C, so a runtime check on camera_info->model cannot tell the units apart. The difference is physical: the module hangs on an FPC cable and fits either way up.
• The Camera Orientation menu is visible if HAS_CAMERA && BOARD_TYPE_CUSTOM, so on a named board the symbol has no visible prompt and always falls back to its default. Whichever default wins, the other half of the builders cannot correct it.
• Preview only: the QR decoder consumes the raw sensor framebuffer (fb->buf), not the rotated copy, so orientation never affects scanning.

Changes

main/storage.h

• Action: add GUI_FLAGS_CAMERA_ROTATED as a bit in the existing GUI_FLAGS_FIELD byte, as requested in diy: fix upside down camera image on Waveshare Touch LCD 2 #331.

main/button_events.h

• Action: add the BTN_SETTINGS_DISPLAY_CAMERA_ROTATE event id.

main/ui/dashboard.c

• Action: add a 'Rotate Camera' entry to the Display settings menu, on camera boards other than the official Jade units.
• Note: the label doubles as the state indicator, reading 'Camera Rotated' while the rotation is active. The menu keeps the same number of items.

main/process/dashboard.c

• Action: toggle the flag and remake the menu screen, following the existing Theme handler pattern.

main/camera.c

• Action: pick between the two already-compiled copy functions at runtime, composing with any flipped display orientation.
• Note: no new copy function and no extra flash cost, copy_camera_image_0 and copy_camera_image_180 are both already built in this configuration and the copy function was already a runtime pointer.

Testing

Waveshare S3 Touch LCD 2 with an OV5640 module, firmware 1.0.41-67:

• Default state is unchanged from before this PR.
• Toggling rotates the camera preview 180 degrees and the menu label becomes 'Camera Rotated'.
• The setting survives a full power cycle.
• Toggling back restores both the preview and the original label.
• Composes correctly with Flip Orientation.

Official Jade units are excluded from the menu entry, and boards without a camera never compile it.

Motivation

Lets each builder correct the camera orientation once from the device menu, with the choice surviving reboots and firmware updates, instead of flipping a build default that regresses the other half of the units.

cc @bota87