feat(plustek): upgrade to pyopticfilm 1.1.2

[jboneng]

Summary

Bumps the Plustek backend to pyopticfilm 1.1.2 and adapts NegPy to the upstream API and orientation fix. Scope is the pyOpticfilm path only — no SANE, roll/feeder, or other backend changes.

pyopticfilm 1.1.2 (library)

Relevant upstream changes this PR depends on:

Added

• Multi-exposure (ME) scanning for OpticFilm 8200i SE: short and long colour passes merged into the deliverable ScanImage.rgb.
• Adaptive quiet USB drain on GL128 (DEFAULT_IMAGE_USB_PACE_S, line-aligned throttle during bulk acquire).
• Integrator notes in docs/negpy-integration.md (orientation, ScanImage contract, migration).

Fixed

• Scan orientation on mirror_x models (8200i SE): left–right correction in ImagePipeline.assemble(); prescan crop no longer applies a compensating X flip.
• ME shadow colour fringes from short/long misregistration: improved pass alignment (phase correlation, ROI refinement) and safer merge at misaligned edges.
• High-PPI memory use in the image pipeline (chunked host processing).
• 8200i SE IR scans: correct colour DVDSET handling; aligned IR plane on ScanImage.ir.

Changed

• ScanImage slimmed to NegPy-facing fields only (rgb, dpi, device_model, optional ir). ME bracket data moved to Scanner.last_me_debug (lab/debug use).
• ME short/long planes stay linear on the bracket; film-base makeup runs once on the merged deliverable.

Integrator notes

• Forward-only orientation fix: files scanned before 1.1.2 may still appear mirrored; rescan if orientation matters.
• Breaking: removed ScanImage ME fields (rgb_short, rgb_long, exposure_*, merge_*, align_shift_*). NegPy does not consume those.

NegPy changes

Dependency

• Require pyopticfilm>=1.1.2 in the plustek optional dependency and lockfile.

Orientation migration

• Remove prescan_mirror_x and crop_to_scan_window() mirror compensation.
• Prescan crop uses clamp_scan_area() directly (1:1 with pyopticfilm TA coords).
• Trust ScanImage.rgb / ScanImage.ir from Scanner.scan() — no NegPy-side horizontal flip.

Plustek backend

• Quiet USB drain always re-applied after Scanner.open() (_ensure_quiet_usb_drain); not exposed in the UI.
• Single-pass colour + IR: one scanner.scan(..., infrared=capture_ir, multi_exposure=...) call replaces the old two-pass colour/IR flow and manual align_ir_to_rgb.
• multi_exposure passed through from ScanParams.

Scan UI

• New Multi-exposure checkbox beside IR (8200i SE only, off by default), gated on caps.multi_exposure.
• Persisted in ScannerSettings.

Docs

• docs/USER_GUIDE.md: multi-exposure control, single-pass IR, orientation/rescan note.
• docs/PLUSTEK_WINDOWS.md: minimum pyopticfilm 1.1.2.

Unchanged

• 8200i SE scan-ready lockout, colour ASIC shading cache, SE bringup/crop geometry.
• SANE backend and non-Plustek scan UI.

Fixes #928

Test plan

• uv sync --group plustek && make test (or uv run pytest tests/scanners/ tests/test_scan_sidebar.py)
• Prescan crop matches scan ROI (no double mirror)
• IR scan: one pass, dust removal aligned
• Multi-exposure off by default; enabled scan completes on 8200i SE
• Compare orientation of a new scan vs SilverFast
• Rescan any pre-1.1.2 files where left/right matters