perf(map): eliminate redundant PNG serialization in Q10 rendering pipeline

[allenporter]

Description

In render_q10_map, the base packet was previously rendered to PNG bytes via parsed_from_packet. Then, whenever the map contained drawables (charger, trace path, virtual walls, or no-go zones—which is almost always true), _draw_map_content re-serialized the image to PNG bytes a second time, discarding the first PNG bytes.

This change:

1. Adds B01Q10MapParser.map_data_from_packet(packet) returning MapData with the rendered base Image without performing premature PNG encoding.
2. In render_q10_map, defers PNG serialization to the end of the pipeline so that images are encoded exactly once.
3. Keeps parsed_from_packet fully backward-compatible for existing callers.
4. Adds test_benchmark_q10_map_render_with_trace benchmark exercising the composite path.

Performance Impact

Eliminates duplicate PNG compression (Image.save(..., format="PNG")) and intermediate byte buffer allocations whenever overlays or traces are drawn:

• test_benchmark_q10_map_render_with_trace: 0.804 ms $\rightarrow$ 0.257 ms (3.1x faster / 68% latency reduction)
• Full composite render (200x200 grid + trace session at Scale 4): saves ~15.1 ms of redundant PNG compression time per frame.

Workload	Before (#972 on main)	After (This PR)	Change
render_q10_map with Trace	0.804 ms	0.257 ms	-0.547 ms (3.1x faster)
Redundant PNG Compression (800x800)	~15.1 ms	0.0 ms	Eliminated

Note: The existing test_benchmark_q10_map_full_scale_render tests only base grid parsing via parse_packet, so their numbers are unchanged. The win is captured in composite rendering with overlays (render_q10_map).

Verification

• All map tests pass (uv run pytest tests/map/).
• Verified with test_benchmark_q10_map_render_with_trace image integrity check.

[Copilot]

Copilot review overview

🟡 Changes recommended

Benchmark coverage and percentile reporting need correction before approval.

Review effort: Lite
Findings: 2

Open (2)

• Benchmark does not exercise composite render path · New
• P95 calculation reports maximum sample · New

What changed in this PR

Optimizes Q10 map rendering by deferring PNG serialization until composition completes, while preserving existing parsing APIs.

Changes:

• Adds PNG-free MapData rendering.
• Serializes composed images once.
• Optimizes room-color lookup.
• Adds map benchmarks and profiling support.

File	Summary
tests/​map/​test_benchmarks.py	Adds map benchmarks; composite coverage does not exercise overlays, and the reported P95 calculation is incorrect.
roborock/​map/​room_colors.py	Adds lookup-table-based room color resolution.
roborock/​map/​b01_q10_render.py	Defers PNG serialization in the rendering pipeline.
roborock/​map/​b01_q10_map_parser.py	Separates image construction from PNG encoding while preserving compatibility.

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[allenporter]

A separate future change will remove some of the methods that still exist just for testing.