feat: add F1 25 telemetry support with Open HUD renderer

[LinyL4]

Summary

F1 25 / F1 2026 Season Pack compatibility

• Adds a native F1 plugin with two UDP decoders: F1 25 (packet format 2025,
  specification v3) and the F1 25: 2026 Season Pack (packet format 2026).
• Selects the decoder by packet-format identifier and validates header fields
  accordingly. Live 2026 Season Pack builds that report game year 25 while
  using the documented 2026 layouts are accepted alongside the documented 26.
• Adds live UDP diagnostics and an F1 UDP setup/forwarding guide
  (docs/F1_UDP.md), plus a README support entry.

Telemetry / plugin architecture

• Extends the core telemetry model with the fields the F1 decoders supply
  (source protocol/format, steering, track position, assists, and related
  state) and adapts the AMS2, ACC, iRacing, and mock plugins to the updated
  trait/model.
• Registers the F1 plugin and adds its settings.

Renderer / 60 Hz visualization

• Caps visualization rebuilds behind a 60 Hz gate so high-rate UDP input no
  longer drives redundant redraws.

Open HUD

• Adds the additive, wgpu-based Open HUD: per-channel color palettes, pedal
  meter, shift lights, steering arc, and large gear/speed readouts with
  radial underglow and a bundled display face.

Verification

• cargo test --release --locked --target x86_64-pc-windows-gnu: 46 passed, 0 failed
• Release build succeeds
• git diff --check clean
• 34 pre-existing float-literal future-compat warnings, unchanged

Non-goals

• No performance testing performed
• No changes to the existing telemetry pipeline semantics, VisualizationSnapshot,
  caching, or the Classic renderer.