Project website + use Apalis crate for task queue (with redis backend)

instead channel and semaphore queue + upgrade to rust 1.99

crates/steep-server/src/metrics.rs

@@ -10,8 +10,8 @@ pub fn webhook_duplicate(event_type: &str) {
     counter!("steep_webhooks_duplicate_total", "event_type" => event_type.to_string()).increment(1);
 }
 
-pub fn webhook_channel_full(event_type: &str) {
-    counter!("steep_webhooks_channel_full_total", "event_type" => event_type.to_string())
+pub fn webhook_enqueue_failed(event_type: &str) {
+    counter!("steep_webhooks_enqueue_failed_total", "event_type" => event_type.to_string())
         .increment(1);
 }
 
@@ -23,6 +23,10 @@ pub fn decrement_task_active() {
     gauge!("steep_bot_tasks_active").decrement(1.0);
 }
 
+pub fn task_skipped(event_type: &str) {
+    counter!("steep_bot_tasks_skipped_total", "event_type" => event_type.to_string()).increment(1);
+}
+
 pub fn task_completed(event_type: &str) {
     counter!("steep_bot_tasks_completed_total", "event_type" => event_type.to_string())
         .increment(1);
@@ -48,15 +52,20 @@ pub fn describe() {
         "Webhooks rejected as duplicates"
     );
     describe_counter!(
-        "steep_webhooks_channel_full_total",
+        "steep_webhooks_enqueue_failed_total",
         Unit::Count,
-        "Webhooks dropped because the bot channel was full"
+        "Webhooks dropped because enqueueing to Redis failed"
     );
     describe_gauge!(
         "steep_bot_tasks_active",
         Unit::Count,
         "Bot tasks currently in progress"
     );
+    describe_counter!(
+        "steep_bot_tasks_skipped_total",
+        Unit::Count,
+        "Reviews skipped because they were already done"
+    );
     describe_counter!(
         "steep_bot_tasks_completed_total",
         Unit::Count,