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.

[allenporter]

Looks good to me, just some small nits

[allenporter]

I dont see any code that uses strings for this. Can you explain what's going on here?

otherwise i think tis can be:

self._room_palette.cached_room_colors.update(room_colors)

[tubededentifrice]

ColorsPalette.get_room_color accepts str | int and intentionally caches both key forms. Since the cache is pre-populated, updating only the integer entries would leave the corresponding string entries at their original colors, so get_room_color("12") could disagree with get_room_color(12) after recoloring. I kept both assignments, made the cache contract explicit in a comment, and added a regression assertion for the two key forms in e44a7ae.

[allenporter]

Does this work as a one-liner?

Suggested change

	self._room_palette.cached_room_colors.clear()
	self._room_palette.cached_room_colors.update(self._base_room_colors)
	self._room_palette.cached_room_colors = {**self._base_room_colors}

[tubededentifrice]

That one-liner does not work because cached_room_colors is a getter-only property; assigning to it raises AttributeError. The clear/update pair intentionally resets the existing dictionary in place. I introduced a local variable and added a comment in e44a7ae to make that constraint clearer.

[allenporter]

Ah ok. So we're mutating a property meant to be readonly. This seems to me like it is abusing this API, and not really whats intended by returning a readonly property.

I want to get this improvement in, but I don't think this is sustainable. We can discuss further in discord how we want to fix this.