feat: compose Q10 maps in a pure renderer

[tubededentifrice]

Summary

Second PR in the Python-roborock#848 split: adds the pure Q10 map-composition layer on top of the review-cleanup branch.

The cleanup base is proposed upstream as Python-roborock#884. This fork-local stacked PR keeps the incremental diff reviewable while that cross-fork base is pending; it can be promoted upstream as soon as Python-roborock#884 lands.

Changes

• Add Q10MapRender, a replace-whole result containing image bytes, MapData, layers, rooms, and calibration.
• Use Q10MapPacket.layers as the renderer boundary introduced by refactor(map): address Q10 decoding review feedback Python-roborock/python-roborock#884.
• Keep calibration solving, erase application, path/position placement, vector-overlay placement, and drawing out of device traits.
• Cover the composition and geometry behavior directly in map-module tests.

This PR intentionally contains no device-trait or subscription orchestration changes.

Validation

• pytest -q tests/map/test_b01_q10_render.py tests/map/test_b01_q10_map_parser.py tests/map/test_b01_grid_layers.py tests/map/test_b01_q10_overlays.py — 74 passed
• pytest -q — 791 passed, 86 snapshots passed
• pre-commit run --show-diff-on-failure --color=always --all-files

Stack

1. refactor(map): address Q10 decoding review feedback Python-roborock/python-roborock#884 — follow-up review cleanup
2. This PR — pure renderer
3. Trait ownership and API integration

[tubededentifrice]

Superseded by the clean upstream PR Python-roborock#885 now that Python-roborock#884 has merged.