fix: Add mountain passes to Multi Mountain mode and fix related crashes

[schi70]

Summary

• Add missing mountain-pass Overpass query and styling params to the Multi Mountain renderer (previously only mountain huts were fetched, so pass names never appeared for multi-day tracks)
• Fix a distance-computation order asymmetry in GpxTrack.load(): the cumulative distance used prev_point.distance_3d(point) while gpxpy's own length_3d() uses point.distance_3d(prev_point) — since gpxpy's flat-earth formula depends on the self point's latitude only, the mismatch grows with segment length and broke the coherence check on simplified/curvy tracks
• Drop unplaceable text labels instead of crashing the whole poster when too many labels are packed into a small area (e.g. a dense cluster of named alpine passes) — the label is skipped, its marker is still drawn
• Fix Profiling's bypass queue leaking across worker-process calls after an exception, which caused an unrelated Bypass queue named 'Parallel' is already set error on the next upload attempt in the same reused worker process

Test plan

• Verified GpxTrack.load() coherence check passes on 5 real-world multi-day GPX tracks (previously failing by up to ~2.5 m) after the distance-order fix
• Verified Multi Mountain poster renders end-to-end (real browser upload) with 5 GPX files spanning a pass-dense alpine region (41 candidate labels, 18 dropped due to overcrowding, poster still completes)
• Verified a @profile_parallel-decorated call that raises no longer blocks a subsequent call in the same process

🤖 Generated with Claude Code

https://claude.ai/code/session_0188FvAtgW3nmYx88h9EBKcp