[refactor](trx-rs): resolve all improvement areas (P1–P3)
P1 — High:
- Merge duplicate APRS/HF-APRS decoder tasks into parameterised inner fn
- Merge duplicate FT8/FT4 decoder tasks into shared ftx inner fn
- Add multi-rig state isolation and command routing tests (listener.rs)
- Add background decode evaluate_bookmark unit tests
P2 — Medium:
- Fix decode-log silent flush errors and rotation failure fallback
- Split api.rs (2,831 LOC) into 7 logical modules (decoder, rig, vchan,
sse, bookmarks, assets, mod)
- Extract background decode decision cascade into pure evaluate_bookmark()
function with ChannelAction enum
- Relax actix-web pin from =4.4.1 to 4.4
- Replace VDES magic numbers with named constants
P3 — Low:
- Add doc comments to AisDecoder, VdesDecoder, RdsDecoder
- Add debug_assert on turbo decoder interleaver/deinterleaver lengths
- Add tracing info_span! to all 10 decoder block_in_place calls
- Optimize hot-path string cloning in remote_client spectrum loop
https://claude.ai/code/session_01Y3G65hrfsRRjwyBF2qbBmc
Signed-off-by: Claude <noreply@anthropic.com>
