fix: add AppState and related types to gateway lib.rs

These were previously in gateway/src/main.rs and accessed by adapters
via crate::AppState. Now that gateway is a library crate, they need to
be in lib.rs for the adapters to compile.

Author: chaodu-agent

crates/openab-gateway/src/lib.rs

@@ -2,3 +2,46 @@ pub mod adapters;
 pub(crate) mod media;
 pub mod schema;
 pub mod store;
+
+use std::collections::HashMap;
+use std::sync::Arc;
+use std::time::Instant;
+use tokio::sync::{broadcast, Mutex, Semaphore};
+
+// --- Reply token cache for LINE hybrid Reply/Push dispatch ---
+
+/// Cache entry for LINE reply tokens: (replyToken, insertion_time).
+pub type ReplyTokenCache = Arc<std::sync::Mutex<HashMap<String, (String, Instant)>>>;
+
+/// Maximum age (in seconds) before a cached reply token is considered expired.
+pub const REPLY_TOKEN_TTL_SECS: u64 = 50;
+
+/// Maximum number of cached reply tokens.
+pub const REPLY_TOKEN_CACHE_MAX: usize = 10_000;
+
+/// Maximum number of post-ack LINE webhook payloads processed concurrently.
+pub const LINE_WEBHOOK_CONCURRENCY_MAX: usize = 8;
+
+// --- App state (shared across all adapters) ---
+
+pub struct AppState {
+    pub telegram_bot_token: Option<String>,
+    pub telegram_secret_token: Option<String>,
+    pub telegram_rich_messages: bool,
+    pub line_channel_secret: Option<String>,
+    pub line_access_token: Option<String>,
+    #[cfg(feature = "teams")]
+    pub teams: Option<adapters::teams::TeamsAdapter>,
+    pub teams_service_urls: Mutex<HashMap<String, (String, Instant)>>,
+    #[cfg(feature = "feishu")]
+    pub feishu: Option<adapters::feishu::FeishuAdapter>,
+    #[cfg(feature = "googlechat")]
+    pub google_chat: Option<adapters::googlechat::GoogleChatAdapter>,
+    #[cfg(feature = "wecom")]
+    pub wecom: Option<adapters::wecom::WecomAdapter>,
+    pub ws_token: Option<String>,
+    pub event_tx: broadcast::Sender<String>,
+    pub reply_token_cache: ReplyTokenCache,
+    pub line_webhook_semaphore: Arc<Semaphore>,
+    pub client: reqwest::Client,
+}