feat(web_api): add firmware/OTA info, update trigger and silent-OTA switch

[ximex]

Summary

Adds cloud firmware/OTA support to RoborockApiClient, so consumers (e.g. the
Home Assistant integration) can expose a firmware update entity and an
auto-update switch. Part of #739 (Roborock Q7 / B01 feature gap).

All three endpoints live on the rriot API host (user_data.rriot.r.a,
e.g. api-eu.roborock.com) with Hawk-signed auth — the same scheme already
used for the home-data endpoints. This was confirmed by capturing the official
Android app via mitmproxy: the IoT host (usiot.roborock.com) returns an empty
body for these paths, the rriot host returns the real data.

What's added

• FirmwareInfo dataclass (version, current_version, updatable, desc,
  release_time, force_update).
• get_firmware_info(user_data, duid) -> GET /ota/firmware/{duid}/updatev2?lang=en.
• start_firmware_update(user_data, duid) -> POST /ota/device/{duid}/upgrade
  (empty body). Triggers the irreversible flash.
• set_silent_ota(user_data, duid, enabled) -> PUT /user/devices/{duid} with
  form field silentOtaSwitch (part of the signed MAC). The current value is
  reported as silent_ota_switch on the home-data device.

Notes

• OTA progress is not available over REST (/upgrade/status returns 400 /
  empty during a flash); the device reports progress over MQTT instead.

Verification

• Live-tested against a real account with a pending update: 03.01.80 available
  while 03.01.74 installed; install trigger and silent-OTA toggle captured
  1:1 from the app.
• New unit tests + aioresponses fixtures; ruff clean.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds OTA/firmware-related Web API support and accompanying test coverage.

Changes:

• Introduces FirmwareInfo container for OTA firmware metadata.
• Adds Web API client methods to fetch firmware info, start firmware update, and toggle silent OTA updates.
• Extends aioresponses fixtures and test suite for the new endpoints.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 7 comments.

File	Description
tests/test_web_api.py	Adds async tests validating new OTA/firmware Web API methods.
tests/fixtures/web_api_fixtures.py	Mocks OTA firmware/info, upgrade, and device update endpoints.
roborock/web_api.py	Implements get_firmware_info, start_firmware_update, and set_silent_ota.
roborock/data/containers.py	Adds FirmwareInfo dataclass to parse OTA firmware metadata.

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