chore(deps): bump twilight 0.17 → 0.18 and adapt the Discord adapter

CHANGELOG.md

@@ -60,6 +60,14 @@
   没有任何 step、恰好 15 分钟整 `cancelled`，**并非 job 超时**）。改为批量后一轮最多
   合并 5 条、只跑一次全量 CI。
 
+
+- **Discord 适配器升级到 twilight 0.18** — 0.18 去掉了 `MessageCreate` 的
+  newtype + `Box<Message>` 包装（内部字段变私有，`msg.0` 不再可见），改为
+  `struct MessageCreate { channel_type, #[serde(flatten)] message: Message }` 并实现
+  `Deref<Target = Message>`。适配器相应改为 `msg.guild_id` / `&msg.message`
+  （`crates/easybot-adapter-discord/src/lib.rs`）。`twilight-*` 现已成组升级，
+  `cargo deny` 的 `multiple-versions` 也保持干净。
+
 ### Fixed
 
 - **`Coverage` 工作流在未配置 `CODECOV_TOKEN` 时必然红灯** — 仓库启用分支保护后，Codecov

crates/easybot-adapter-discord/Cargo.toml

@@ -17,8 +17,8 @@ reqwest = { workspace = true }
 base64.workspace = true
 
 # Discord Gateway SDK (v0.17)
-twilight-gateway = { version = "0.17", default-features = false, features = ["rustls-platform-verifier", "twilight-http", "zlib"] }
-twilight-model = "0.17"
+twilight-gateway = { version = "0.18", default-features = false, features = ["rustls-platform-verifier", "twilight-http", "zlib"] }
+twilight-model = "0.18"
 
 [dev-dependencies]
 wiremock = "0.6"

crates/easybot-adapter-discord/src/lib.rs

@@ -538,7 +538,7 @@ impl DiscordAdapter {
                             heartbeat.beat_success(); // stream-health: message received
 
                             // Resolve guild owner from cache
-                            let guild_id_str = msg.0.guild_id.map(|g| g.to_string());
+                            let guild_id_str = msg.guild_id.map(|g| g.to_string());
                             let owner_id = guild_id_str.as_ref().and_then(|gid| {
                                 guild_owner_cache.try_lock().ok()
                                     .and_then(|cache| cache.get(gid).cloned())
@@ -583,7 +583,7 @@ impl DiscordAdapter {
                                     .and_then(|cache| cache.get(gid).cloned())
                             });
                             if let Some(inbound) = DiscordAdapter::convert_message(
-                                &msg.0,
+                                &msg.message,
                                 &bot_user_id,
                                 owner_id.as_deref(),
                                 guild_name.as_deref(),