[FEATURE] Capture and display sender IP address for incoming messages

Capture the source IP address of every incoming message received by the server and persist it alongside the message metadata. Display this information in the LogStream UI so users can identify the origin of each message, improving diagnostics, troubleshooting, and monitoring.

Acceptance Criteria
- [ ] Sender IP address is captured for all incoming messages.
- [ ] IP address is stored together with the message metadata.
- [ ] UI displays the sender IP address for each message.
- [ ] Existing functionality continues to work without regressions.
- [ ] Documentation is updated if required.

Start by tracing how the PHP server receives incoming messages and how message metadata is persisted, then locate the LogStream UI entry that renders each message. Confirm the sender IP is available through the full path from ingestion to display, and verify all acceptance criteria, including existing functionality and any needed documentation.

Written by the indexing model from the issue text.