feat: align Q10 map colors with V1

[tubededentifrice]

Summary

First rendering slice extracted from #900. The Q10 base raster now follows the V1 map palette, including transparent out-of-map pixels, while both map formats share the same deterministic adjacent-room color policy.

Changes

• render floor, wall, room, and outside pixels with the V1 palette
• make pixels outside the map transparent
• assign room colors deterministically while avoiding the same color for adjacent rooms where possible
• reset V1 palette state per render so repeated and concurrent renders stay independent
• keep this slice limited to map parsing/rasterization; it has no trait or transport changes

Before / after

The same synthetic occupancy grid is rendered on main and on this branch.
The checkerboard in the after image denotes transparency.

Before	After

Validation

• pytest -q — 882 passed, 86 snapshots passed
• pre-commit run --files ... — all hooks passed

Stack

1. This PR: base raster and room palette
2. refactor: render Q10 overlays with V1 #903: V1 overlay renderer
3. fix: show docked Q10 robot on map #904: docked-state composition

The transport correction is independent in #901. #900 remains the aggregate real-device/Home Assistant before-and-after reference.