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

instead channel and semaphore queue + upgrade to rust 1.99

README.md

@@ -1,4 +1,4 @@
-![Steep — Let your code steep](banniere_readme.png)
+![Steep — Let your code steep](public/banniere_readme.png)
 
 # Steep
 
@@ -38,6 +38,7 @@ Steep reads its configuration from environment variables (a `.env` file is suppo
 | `GITEA_URL` | Base URL of your Gitea instance |
 | `GITEA_TOKEN` | Gitea API token |
 | `GITEA_TIMEOUT` | Gitea API request timeout in seconds |
+| `REDIS_URL` | Redis connection URL used for the durable review queue (e.g. `redis://127.0.0.1:6379`) |
 | `METRICS_BIND_ADDR` | *(optional)* Bind address for the Prometheus metrics endpoint (e.g. `0.0.0.0:9100`). If unset, the metrics exporter is disabled. |
 | `SENTRY_DSN` | *(optional)* Sentry DSN for error tracking |
 | `RUST_LOG` | *(optional)* Log level, defaults to `info` |
@@ -128,8 +129,9 @@ Set `METRICS_BIND_ADDR` (e.g. `0.0.0.0:9100`) to enable it. The metrics are then
 |---|---|---|
 | `steep_webhooks_received_total` | counter | Total webhooks received (label: `event_type`) |
 | `steep_webhooks_duplicate_total` | counter | Webhooks rejected as duplicates (label: `event_type`) |
-| `steep_webhooks_channel_full_total` | counter | Webhooks dropped because the bot channel was full (label: `event_type`) |
+| `steep_webhooks_enqueue_failed_total` | counter | Webhooks dropped because enqueueing to Redis failed (label: `event_type`) |
 | `steep_bot_tasks_active` | gauge | Bot tasks currently in progress |
+| `steep_bot_tasks_skipped_total` | counter | Reviews skipped because they were already done (label: `event_type`) |
 | `steep_bot_tasks_completed_total` | counter | Bot tasks completed successfully (label: `event_type`) |
 | `steep_bot_tasks_failed_total` | counter | Bot tasks that failed (label: `event_type`) |
 | `steep_openrouter_cost_cents_total` | counter | Total OpenRouter cost in cents (divide by 100 for USD) |