add http API, channel-driven life loop, predefined diary timer

- Extract http.rs: unified HTTP server with /api/timers and gitea webhook
- Life loop: select! on interval tick + mpsc channel for force-fire
- Predefined diary timer (cron 22:55 daily), auto-registered on startup
- BufferOutput for system timers (chat_id=0), no TG message
- state: ensure_timer(), get_timer()
- context.md: add blog and Hugo docs for AI

src/main.rs

@@ -1,6 +1,7 @@
 mod config;
 mod display;
 mod gitea;
+mod http;
 mod life;
 mod output;
 mod state;
@@ -92,16 +93,18 @@ async fn main() {
 
     let config = Arc::new(config);
 
-    // start life loop
-    tokio::spawn(life::life_loop(bot.clone(), state.clone(), config.clone()));
+    // channel: http server → life loop
+    let (life_tx, life_rx) = tokio::sync::mpsc::channel(16);
 
-    // start gitea webhook server
-    if let Some(gitea_config) = &config.gitea {
-        let gc = gitea_config.clone();
-        // Use the gitea admin username as the bot user for @mention detection
-        let bot_user = std::env::var("GITEA_ADMIN_USER").unwrap_or_else(|_| "noc".into());
+    // start life loop
+    tokio::spawn(life::life_loop(bot.clone(), state.clone(), config.clone(), life_rx));
+
+    // start http server (API + gitea webhook)
+    {
+        let srv_config = config.clone();
+        let srv_state = state.clone();
         tokio::spawn(async move {
-            gitea::start_webhook_server(&gc, bot_user).await;
+            http::start_http_server(&srv_config, srv_state, life_tx).await;
         });
     }