[dahuadoor] Extend snapshot handling and align WebRTC URL

[svnsssd]

Description

This PR extends the DahuaDoor binding snapshot pipeline:

• add snapshotMode=dhip to download event files (ring, hangup, unlock, recordings, video messages) from the VTO SD card, with new path/toggle/maxEvents options and grouped cleanup
• keep snapshotMode=api for live snapshots when no SD card/events are used, and update VTO3211 lock-aware naming
• align the WebRTC URL to /dahuadoor/webrtc/session?thing=... and fall back to a default stream when no SIP client is available
• update documentation and i18n labels to match the new options and file formats

Testing

• mvn clean install -DskipTests (bundles/org.openhab.binding.dahuadoor)
• functional test for VTO2202

[Copilot]

Pull request overview

This PR extends the DahuaDoor binding’s snapshot subsystem by adding a DHIP “event file” download pipeline (NewFile-based) alongside the existing live HTTP snapshot mode, and it standardizes the WebRTC SDP proxy URL around /dahuadoor/webrtc/session?thing=... with a fallback when no SIP client is available. It also updates thing definitions, i18n labels, and README documentation to expose/describe the new configuration options and file naming/retention behavior.

Changes:

• Add snapshotMode=dhip and related download/toggle/path/retention configuration for DHIP NewFile event files (snapshots, hangup, unlock, recordings, video messages), plus grouped cleanup.
• Align WebRTC URL publication to /dahuadoor/webrtc/session?thing=... and add a “default stream” fallback when no SIP client is free/available.
• Update VTO3211 lock-aware snapshot naming and refresh README/i18n/thing XML to match new options and formats.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
bundles/org.openhab.binding.dahuadoor/src/main/resources/OH-INF/thing/vto3211.xml	Adds new DHIP snapshot/event download configuration parameters for VTO3211.
bundles/org.openhab.binding.dahuadoor/src/main/resources/OH-INF/thing/vto2202.xml	Adds matching DHIP snapshot/event download configuration parameters for VTO2202.
bundles/org.openhab.binding.dahuadoor/src/main/resources/OH-INF/i18n/dahuadoor.properties	Adds i18n labels/descriptions/options for the new config parameters.
bundles/org.openhab.binding.dahuadoor/src/main/java/org/openhab/binding/dahuadoor/internal/media/PlayStreamServlet.java	Implements /webrtc/session default-stream fallback when no SIP client is available.
bundles/org.openhab.binding.dahuadoor/src/main/java/org/openhab/binding/dahuadoor/internal/DahuaVto3211Handler.java	Adds lock-aware channel/suffix mapping and bypasses API snapshot when in DHIP mode.
bundles/org.openhab.binding.dahuadoor/src/main/java/org/openhab/binding/dahuadoor/internal/DahuaVto2202Handler.java	Bypasses API snapshot when in DHIP mode and reuses shared API snapshot helper.
bundles/org.openhab.binding.dahuadoor/src/main/java/org/openhab/binding/dahuadoor/internal/dahuaeventhandler/DahuaEventClient.java	Adds DHIP FileManager.downloadFile support and refactors frame parsing to raw payloads.
bundles/org.openhab.binding.dahuadoor/src/main/java/org/openhab/binding/dahuadoor/internal/DahuaDoorConfiguration.java	Introduces new config fields (mode/toggles/paths/maxEvents) with defaults.
bundles/org.openhab.binding.dahuadoor/src/main/java/org/openhab/binding/dahuadoor/internal/DahuaDoorBaseHandler.java	Implements DHIP NewFile classification, download/store logic, retention cleanup, and WebRTC URL alignment.
bundles/org.openhab.binding.dahuadoor/README.md	Documents new snapshot modes/options, storage layout, naming scheme, and updated WebRTC URL.

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[lsiepel]

Thanks, LGTM