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/router.rs

@@ -52,8 +52,7 @@ impl PacketRouter {
                 Ok(packet) => {
                     debug!("Parsed Packet: {:?}", packet);
                     // Handle the parsed packet (route it, process it, etc.)
-                    self.route_packet(stream, packet, connection_id.clone())
-                        .await?;
+                    self.route_packet(stream, packet, connection_id.clone()).await?;
                 }
                 Err(e) => warn!("Failed to parse packet: {}", e),
             }