feat(matrix): add multi-room support with per-room config

[navsteruk]

Summary

• Add multi-room Matrix support with per-room configuration (aligned with OpenClaw's approach)
• Each room can be individually enabled/disabled and set to require mentions
• Fix channel name lookup that prevented replies from being sent back to Matrix

Changes

• schema.rs: New struct with and fields; optional on
• matrix.rs: Activate dormant multi-room filter in event handler; add per-room mention detection using bot display name
• mod.rs: Pass room configs to MatrixChannel constructor; fix channel name lookup to strip room ID suffix

Config example

[channels_config.matrix]
homeserver = "https://matrix.example.org"
access_token = "..."
room_id = "!main:matrix.org"  # default room for proactive messages
allowed_users = ["@user:matrix.org"]

[channels_config.matrix.rooms]
"!main:matrix.org" = { enabled = true, require_mention = false }
"!team:matrix.org" = { enabled = true, require_mention = true }

When rooms is absent, behavior is identical to the current single-room mode.

Bug fix included

The msg.channel field includes the room ID (e.g. matrix:!room:server) but channels_by_name is keyed by just the channel name (matrix). This caused target_channel to be None, silently dropping all replies. Fixed by stripping the room suffix before lookup.

Test plan

• Tested with single room config (backward compatible, no rooms field)
• Tested with multiple rooms, each with different require_mention settings
• Verified replies land in the correct room
• Verified mention-only rooms filter correctly
• Tested on homelab with Synapse + Element

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