Add comprehensive documentation and unit tests

Documentation:
- Add detailed README files for all services (auth, character, database, launcher, packet, utils, world)
- Create API documentation for the database service with detailed endpoint specifications
- Document database schema and relationships
- Add service architecture overviews and configuration instructions

Unit Tests:
- Implement comprehensive test suite for database repositories (user, character, session)
- Add gRPC service tests for database interactions
- Create tests for packet service components (bufferpool, connection, packets)
- Add utility service tests (health check, logging, load balancer, redis cache, service discovery)
- Implement auth service user tests
- Add character service tests

Code Structure:
- Reorganize test files into a more consistent structure
- Create a dedicated tests crate for integration testing
- Add test helpers and mock implementations for easier testing

packet-service/src/main.rs

@@ -21,8 +21,8 @@ use tokio::{select, signal};
 use tracing::Level;
 use tracing::{debug, error, info, warn};
 use tracing_subscriber::EnvFilter;
+use utils::service_discovery::get_kube_service_endpoints_by_dns;
 use utils::{health_check, logging};
-use utils::service_discovery::{get_kube_service_endpoints_by_dns};
 use warp::Filter;
 
 mod auth_client;
@@ -66,8 +66,20 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     let addr = env::var("LISTEN_ADDR").unwrap_or_else(|_| "0.0.0.0".to_string());
     let port = env::var("SERVICE_PORT").unwrap_or_else(|_| "29000".to_string());
     let metrics_port = env::var("PACKET_METRICS_PORT").unwrap_or_else(|_| "4001".to_string());
-    let auth_url = format!("http://{}",get_kube_service_endpoints_by_dns("auth-service","tcp","auth-service").await?.get(0).unwrap());
-    let character_url = format!("http://{}",get_kube_service_endpoints_by_dns("character-service","tcp","character-service").await?.get(0).unwrap());
+    let auth_url = format!(
+        "http://{}",
+        get_kube_service_endpoints_by_dns("auth-service", "tcp", "auth-service")
+            .await?
+            .get(0)
+            .unwrap()
+    );
+    let character_url = format!(
+        "http://{}",
+        get_kube_service_endpoints_by_dns("character-service", "tcp", "character-service")
+            .await?
+            .get(0)
+            .unwrap()
+    );
 
     // Start health-check endpoint
     health_check::start_health_check(addr.as_str()).await?;
@@ -109,9 +121,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
                 {
                     error!("Error handling connection: {}", e);
                 }
-                packet_router
-                    .connection_service
-                    .remove_connection(&connection_id);
+                packet_router.connection_service.remove_connection(&connection_id);
             });
         }
     });