feat: add RTL8720F Realtek radar beta support (#1356)

* docs(adr): plan RTL8720F radar SDK integration

* feat(hardware): add Rust RTL8720F radar simulator

* feat(ruview): ingest RTL8720F radar frames
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# RuView v0.9.0-realtek-beta.1
This prerelease introduces the Rust-first RTL8720F 2.4 GHz radar transport and
RuView ingestion path. It is intentionally simulator-validated until Realtek
hardware and the vendor SDK callback ABI arrive.
## Included
- ADR-263 records the upstream Ameba integration and licensing boundary.
- ADR-264 defines a versioned, bounded, CRC-protected radar envelope.
- `rtl8720f-sim` emits deterministic CFR, near-range, far-range, interference,
and capability reports to UDP or replay files.
- The sensing server validates RTL8720F datagrams, publishes bounded summaries
over `/ws/sensing`, and exposes the latest report at
`/api/v1/radar/latest`.
- Synthetic provenance is retained end to end as `realtek:simulated`; simulator
data is never presented as hardware data.
## Compatibility
The adapter tracks the radar control surface proposed by Ameba RTOS pull
request #1336 (`wifi_radar_config`, `AT+RAD`, and `AT+RADDBG`). The stable Ameba
RTOS v1.2.1 release does not yet expose the complete radar receive callback ABI,
so no vendor-private headers or binary libraries are copied into this release.
## Validation status
- Rust codec round trips, corruption rejection, size bounds, and deterministic
simulator tests pass.
- RuView server ingestion, REST reporting, and source provenance were exercised
end to end over loopback UDP.
- Windows release binaries are built from this branch and accompanied by
SHA-256 checksums.
## Known limitations
- No physical RTL8720F board has been flashed or measured.
- The vendor report callback and exact report layouts remain an SDK/hardware
validation gate; the adapter boundary may change when those arrive.
- This beta exposes transport and aggregate radar observability. Radar-to-pose,
vital-sign inference, RF calibration, and accuracy claims are not enabled.
- 2.4 GHz radar reports are not mislabeled as mmWave or Wi-Fi CSI events.
Do not deploy this prerelease for safety-critical, medical, or occupancy billing
uses. It is an integration beta for SDK and hardware bring-up.