v0.34.1-beta.10

• Fix DysonDustMapImage._build() v2 condition: replace
  'if download_url and not dust_map_model' with
  'if not dust_map_model and clean_id' so the v2 cloud-fetch
  path is taken for devices (e.g. RB05) that omit downloadUrl
  from the clean-maps response but do provide a clean_id

• Add _render_v2_floor_plan_png(): renders zone boundary line
  segments (zones[i].presentation[j].{start,end}) from the
  CleanMapResponse on a white canvas with a dock location
  indicator; APK-decompiled PersistentMapResponse confirmed
  the v2 persistent-maps endpoint returns vector zone data
  rather than a pre-rendered PNG

• Add _fetch_v2_floor_plan_image(): fetches the same
  clean-maps-data payload already used for dust maps and
  renders it as a floor plan; cached in _floor_plan_cache
  (6-hour TTL) keyed as '{serial}:fp:{clean_id}'

• Update DysonFloorPlanImage._build(): after Map Visualizer
  returns 404 (expected for v2 devices), now falls back to
  _fetch_v2_floor_plan_image() using the latest clean_id

• Add _floor_plan_cache TTLCache (6-hour TTL)

• Update module docstring to reflect all three floor plan
  rendering strategies

• Bump version to 0.34.1-beta.10

• Add 14 new tests (109 total): TestRenderV2FloorPlanPng (9),
  TestFetchV2FloorPlanImage (3), updated dust map condition
  tests (2 new/updated)