refactor(semantics): migrate legacy @TIER to @COMPLEXITY annotations

- Replaced @TIER: TRIVIAL with @COMPLEXITY: 1
- Replaced @TIER: STANDARD with @COMPLEXITY: 3
- Replaced @TIER: CRITICAL with @COMPLEXITY: 5
- Manually elevated specific critical/complex components to levels 2 and 4
- Ignored legacy, specs, and node_modules directories
- Updated generated semantic map

frontend/src/services/adminService.js

@@ -1,6 +1,6 @@
 // [DEF:adminService:Module]
 //
-// @TIER:      STANDARD
+// @COMPLEXITY: 3
 // @SEMANTICS: admin, users, roles, ad-mappings, api
 // @PURPOSE:   Service for Admin-related API calls (User and Role management).
 // @LAYER:     Service

frontend/src/services/gitService.js

@@ -1,6 +1,6 @@
 // [DEF:GitServiceClient:Module]
 /**
- * @TIER:      STANDARD
+ * @COMPLEXITY: 3
  * @SEMANTICS: git, service, api, client
  * @PURPOSE:   API client for Git operations, managing the communication between frontend and backend.
  * @LAYER:     Service

frontend/src/services/storageService.js

@@ -1,6 +1,6 @@
 // [DEF:storageService:Module]
 /**
- * @TIER:   STANDARD
+ * @COMPLEXITY: 3
  * @purpose Frontend API client for file storage management.
  * @layer   Service
  * @relation DEPENDS_ON -> backend.api.storage