Rebrand RadCam to 4K Cam Manager (br4kcam_*)

[joaoantoniocardoso]

Summary

• Rebrand the product to 4K Cam and the extension/app to 4K Cam Manager
• Rename technical identifiers to the br4kcam_* / br4kcam-manager scheme (br = Blue Robotics; Cargo names cannot start with a digit)
• Stamp lua scripts with BLUEROBOTICS_4K_CAM_MANAGER_SCRIPT and remove conflicting owned scripts by content markers, not by filename (historical exports match Focus correction script. This script was generated and exported by)
• Autopilot param table prefix RCAM → BR4KCAM; default script path /scripts/br4kcam.lua

Notes

• This is a breaking packaging change: BlueOS extension id/image/volume paths/binary name change. Existing installs need a new extension install (settings under the old volume path are not migrated here).
• GitHub repo/URL rename to br4kcam-manager is still required for homepage/readme links that already point at the new name.
• Logo/icon unchanged (placeholder mdi-camera-outline).

Test plan

• cargo check --workspace and cargo test -p autopilot --lib
• cargo run --bin=bindings then npm run selfcheck / type-check in frontend/
• Fresh UI shows 4K Cam Manager title and health/connection copy without the old product name
• Applying hardware setup writes /scripts/br4kcam.lua containing the ownership marker
• An old legacy script beside it that matches the shared header line is removed on export/status refresh