feat(config): integrate etcd for service discovery and config management

- Add etcd-client dependency for distributed configuration storage
- Implement EtcdConfig with priority: etcd > environment variables > defaults
- Add ServiceRegistry for service registration with lease keep-alive
- Integrate etcd-based service discovery for appks gRPC connections
- Add service watcher for real-time service instance updates
- Migrate Redis configuration from single URL to cluster node list
- Update Dockerfile with default IMKS_HOST and IMKS_PORT environment variables
- Add etcd bootstrap configuration through environment variables
- Implement Redis cluster URL building with optional authentication

telemetry/logs.rs

@@ -2,12 +2,12 @@
 
 use opentelemetry_appender_tracing::layer::OpenTelemetryTracingBridge;
 use opentelemetry_otlp::{LogExporter, Protocol, WithExportConfig};
-use opentelemetry_sdk::logs::SdkLoggerProvider;
 use opentelemetry_sdk::Resource;
-use tracing_subscriber::fmt::format::FmtSpan;
-use tracing_subscriber::layer::SubscriberExt;
+use opentelemetry_sdk::logs::SdkLoggerProvider;
 use tracing_subscriber::EnvFilter;
 use tracing_subscriber::Registry;
+use tracing_subscriber::fmt::format::FmtSpan;
+use tracing_subscriber::layer::SubscriberExt;
 
 use super::config::{OtlpProtocol, TelemetryConfig};
 use crate::ImksResult;
@@ -35,7 +35,9 @@ pub fn init_subscriber(
     let (logger_provider, log_bridge_layer) = if config.logs_enabled {
         let exporter = build_log_exporter(config)?;
 
-        let resource = resource.cloned().unwrap_or_else(|| Resource::builder().build());
+        let resource = resource
+            .cloned()
+            .unwrap_or_else(|| Resource::builder().build());
 
         let provider = SdkLoggerProvider::builder()
             .with_resource(resource)
@@ -72,9 +74,7 @@ pub fn init_subscriber(
             set_subscriber(subscriber);
         }
         (None, None) => {
-            let subscriber = Registry::default()
-                .with(env_filter)
-                .with(make_json_fmt());
+            let subscriber = Registry::default().with(env_filter).with(make_json_fmt());
             set_subscriber(subscriber);
         }
     }