[feat](trx-client): add configurable decode history retention
Add a default decode history retention setting in minutes with per-rig overrides, resolve the active rig retention in the HTTP frontend runtime, and apply that retention consistently across backend decode history buffers and frontend decoder views. This removes fixed APRS, HF APRS, AIS, VDES, FT8, and WSPR browser-side history caps in favor of time-based pruning, and includes the pending longest-QSO card style reset.
Verification: cargo test -p trx-client config
Verification: cargo test -p trx-frontend-http --no-run
Verification: node --check src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js
Verification: node --check src/trx-client/trx-frontend/trx-frontend-http/assets/web/plugins/aprs.js
Verification: node --check src/trx-client/trx-frontend/trx-frontend-http/assets/web/plugins/hf-aprs.js
Verification: node --check src/trx-client/trx-frontend/trx-frontend-http/assets/web/plugins/ais.js
Verification: node --check src/trx-client/trx-frontend/trx-frontend-http/assets/web/plugins/vdes.js
Verification: node --check src/trx-client/trx-frontend/trx-frontend-http/assets/web/plugins/ft8.js
Verification: node --check src/trx-client/trx-frontend/trx-frontend-http/assets/web/plugins/wspr.js
Verification: git diff --check -- src/trx-client/src/config.rs src/trx-client/src/main.rs src/trx-client/trx-frontend/src/lib.rs src/trx-client/trx-frontend/trx-frontend-http/src/api.rs src/trx-client/trx-frontend/trx-frontend-http/src/audio.rs src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js src/trx-client/trx-frontend/trx-frontend-http/assets/web/plugins/aprs.js src/trx-client/trx-frontend/trx-frontend-http/assets/web/plugins/hf-aprs.js src/trx-client/trx-frontend/trx-frontend-http/assets/web/plugins/ais.js src/trx-client/trx-frontend/trx-frontend-http/assets/web/plugins/vdes.js src/trx-client/trx-frontend/trx-frontend-http/assets/web/plugins/ft8.js src/trx-client/trx-frontend/trx-frontend-http/assets/web/plugins/wspr.js
Co-authored-by: OpenAI Codex <codex@openai.com>
Signed-off-by: Stan Grams <sjg@haxx.space>
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