Revolt adapter: broken for self-hosted instances + group mentions silently ignored

[stoicforgeio]

Description

Related: #973 (rustls CryptoProvider panic was fixed in 320d059, but the remaining issues below are still open)

Bugs

1. api_url config field is ignored

channel_bridge.rs line ~1460 calls RevoltAdapter::new(token) which uses the hardcoded default https://api.revolt.chat. The api_url from RevoltConfig is never passed through. Should use RevoltAdapter::with_urls() instead.

2. No ws_url config field

RevoltConfig has api_url but no ws_url. The WebSocket URL is hardcoded to wss://ws.revolt.chat. Self-hosted instances need to configure both.

3. Group chat @mentions are silently dropped

parse_revolt_message() doesn't set metadata["was_mentioned"]. The bridge checks this field when group_policy=mention_only (the default), so all group messages — including direct @mentions — are ignored.

Expected Behavior

Fix: check the mentions array from Revolt's WebSocket payload for the bot's user ID:

let was_mentioned = data
    .get("mentions")
    .and_then(|m| m.as_array())
    .map(|arr| arr.iter().any(|v| v.as_str() == Some(bot_user_id)))
    .unwrap_or(false);
metadata.insert("was_mentioned".to_string(), serde_json::Value::Bool(was_mentioned));

Steps to Reproduce

Bugs 1 + 2 (self-hosted)

1. Set up a self-hosted Revolt instance (e.g. https://chat.example.com)
2. Create a bot and copy its token
3. Configure OpenFang:

[channels.revolt]
api_url = "https://chat.example.com/api"
ws_url = "wss://chat.example.com/ws"
bot_token_env = "REVOLT_BOT_TOKEN"
default_agent = "assistant"

4. Set the token: export REVOLT_BOT_TOKEN="your-self-hosted-bot-token"
5. Start OpenFang — the daemon logs Revolt authentication failed 401 Unauthorized because it authenticates against the hardcoded https://api.revolt.chat instead of your configured api_url. The self-hosted bot token is invalid on the public API.
6. Even if api_url were fixed, the WebSocket would still connect to the hardcoded wss://ws.revolt.chat — self-hosted instances typically serve the Bonfire WebSocket at a different URL (e.g. wss://chat.example.com/ws), and there's no ws_url config field to set it.

Bug 3 (any Revolt instance, including public)

1. Get a working Revolt bot connected (using the public API, where bugs 1+2 don't apply)
2. Add the bot to a server/group channel
3. Send @BotName hello in the group channel
4. The bot does not respond — logs show: Ignoring group message on revolt (group_policy=mention_only, not mentioned)
5. The Revolt WebSocket payload includes "mentions":["<bot_user_id>"] but parse_revolt_message() never reads this field or sets metadata["was_mentioned"], so the bridge drops it

OpenFang Version

0.5.5

Operating System

Linux (x86_64)

Logs / Screenshots

Note Cargo.toml reports
0.5.1