Add live dashboard with SSE job events

Expose /jobs, /dedup, and /events routes backed by a new EventBus that
broadcasts job lifecycle and per-job progress over SSE. Serve a static
dashboard from front/ that lists pending and in-progress jobs, streams
agent activity, and shows completed reviews.

Also add migrate-apply/migrate-generate scripts that load .env, update
the Containerfile to ship the front assets and use the apply script, and
refresh the roadmap.

crates/steep-server/src/main.rs

@@ -1,8 +1,8 @@
 use std::time::Duration;
 
 use crate::{
-    bot::Bot, dedup::Dedup, gitea::GiteaAPI, job_queue::JobQueue, open_router::OpenRouterClient,
-    sandbox::SandboxConfig, state::AppState,
+    bot::Bot, dedup::Dedup, event_bus::EventBus, gitea::GiteaAPI, job_queue::JobQueue,
+    open_router::OpenRouterClient, sandbox::SandboxConfig, state::AppState,
 };
 
 use dotenvy::dotenv;
@@ -19,6 +19,7 @@ mod db;
 mod dedup;
 mod env;
 mod errors;
+mod event_bus;
 mod gitea;
 mod job_queue;
 mod metrics;
@@ -126,6 +127,7 @@ async fn run() -> anyhow::Result<()> {
     let db = db::connect(&config.database_url).await?;
     let dedup = Dedup::new(db.clone());
     let queue = JobQueue::new(db);
+    let event_bus = EventBus::new();
 
     let bot = Bot::new(
         gitea_api,
@@ -135,13 +137,16 @@ async fn run() -> anyhow::Result<()> {
         sandbox,
         dedup.clone(),
         queue.clone(),
+        event_bus.clone(),
     );
 
     let app_state = AppState {
         queue,
         dedup,
+        event_bus,
         bot_name: gitea_user.login.clone(),
         config,
+        shutdown: shutdown.clone(),
     };
 
     let signal = async {
@@ -166,7 +171,7 @@ async fn run() -> anyhow::Result<()> {
         result = async {
             tokio::try_join!(
                 bot.start(shutdown.clone()),
-                api::start(app_state, shutdown.clone()),
+                api::start(app_state),
                 signal
             )
         } => {