Refactor Steam adapter packages and update docs

Move steam_adapter sources from domain.* to modules.* and rename controller package to api. Update package declarations and imports across SteamTestController, SteamPlayerSummaryResponse, SteamClientConfig, and SteamApiService. Update README to re-label Controller -> API layer and Domain -> Business layer and adjust wording about layer boundaries. Also normalize file endings/newlines in several Java files. No functional logic changes were made.

src/main/java/core_service/CoreServiceApplication.java

@@ -10,3 +10,4 @@ public class CoreServiceApplication {
         SpringApplication.run(CoreServiceApplication.class, args);
     }
 }
+

src/main/java/core_service/configuration/security/JwtAuthenticationFilter.java

@@ -66,3 +66,4 @@ public class JwtAuthenticationFilter extends OncePerRequestFilter {
         filterChain.doFilter(request, response);
     }
 }
+

src/main/java/core_service/configuration/security/JwtConfig.java

@@ -13,3 +13,4 @@ public class JwtConfig {
 
     private String secret;
 }
+

src/main/java/core_service/configuration/security/JwtService.java

@@ -53,3 +53,4 @@ public class JwtService {
         return Keys.hmacShaKeyFor(keyBytes);
     }
 }
+

src/main/java/core_service/configuration/security/SecurityConfig.java

@@ -64,4 +64,4 @@ public class SecurityConfig {
 
         return http.build();
     }
-}
+}

src/main/java/core_service/modules/steam_adapter/api/SteamTestController.java

@@ -1,7 +1,7 @@
-package core_service.domain.steam_adapter.controller;
+package core_service.modules.steam_adapter.api;
 
-import core_service.domain.steam_adapter.controller.dto.response.SteamPlayerSummaryResponse;
-import core_service.domain.steam_adapter.service.SteamApiService;
+import core_service.modules.steam_adapter.api.dto.response.SteamPlayerSummaryResponse;
+import core_service.modules.steam_adapter.service.SteamApiService;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.GetMapping;
@@ -29,4 +29,4 @@ public class SteamTestController {
             return ResponseEntity.notFound().build();
         }
     }
-}
+}

src/main/java/core_service/modules/steam_adapter/api/dto/response/SteamPlayerSummaryResponse.java

@@ -1,4 +1,4 @@
-package core_service.domain.steam_adapter.controller.dto.response;
+package core_service.modules.steam_adapter.api.dto.response;
 
 import java.util.List;
 
@@ -12,4 +12,4 @@ public record SteamPlayerSummaryResponse(SteamResponse response) {
             String profileurl,
             String avatarfull
     ) {}
-}
+}

src/main/java/core_service/modules/steam_adapter/config/SteamClientConfig.java

@@ -1,4 +1,4 @@
-package core_service.domain.steam_adapter.config;
+package core_service.modules.steam_adapter.config;
 
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.context.annotation.Bean;
@@ -13,4 +13,4 @@ public class SteamClientConfig {
                 .baseUrl(baseUrl)
                 .build();
     }
-}
+}

src/main/java/core_service/modules/steam_adapter/service/SteamApiService.java

@@ -1,6 +1,6 @@
-package core_service.domain.steam_adapter.service;
+package core_service.modules.steam_adapter.service;
 
-import core_service.domain.steam_adapter.controller.dto.response.SteamPlayerSummaryResponse;
+import core_service.modules.steam_adapter.api.dto.response.SteamPlayerSummaryResponse;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.factory.annotation.Value;
@@ -42,4 +42,4 @@ public class SteamApiService {
 
         return Optional.empty();
     }
-}
+}

src/main/java/core_service/shared/security/UserPrincipal.java

@@ -16,3 +16,4 @@ public record UserPrincipal(
         return Long.parseLong(id);
     }
 }
+