Replace getStorageForRequest with s.storage (bd-32)

- Replaced all getStorageForRequest(req) calls with direct s.storage access
- Updated 5 handler files: server_issues_epics.go (~8 calls), server_labels_deps_comments.go (~4 calls), server_compact.go (~2 calls), server_export_import_auto.go (~2 calls), server_routing_validation_diagnostics.go (~1 call)
- Only remaining references are in server_cache_storage.go (to be deleted in bd-33) and server_eviction_test.go (to be deleted in bd-34)
- Part of bd-29 epic to remove daemon storage cache

Amp-Thread-ID: https://ampcode.com/threads/T-239a5531-68a5-4c98-b85d-0e3512b2553c
Co-authored-by: Amp <amp@ampcode.com>

internal/rpc/server_compact.go

@@ -18,13 +18,7 @@ func (s *Server) handleCompact(req *Request) Response {
 		}
 	}
 
-	store, err := s.getStorageForRequest(req)
-	if err != nil {
-		return Response{
-			Success: false,
-			Error:   fmt.Sprintf("failed to get storage: %v", err),
-		}
-	}
+	store := s.storage
 
 	sqliteStore, ok := store.(*sqlite.SQLiteStorage)
 	if !ok {
@@ -233,13 +227,7 @@ func (s *Server) handleCompactStats(req *Request) Response {
 		}
 	}
 
-	store, err := s.getStorageForRequest(req)
-	if err != nil {
-		return Response{
-			Success: false,
-			Error:   fmt.Sprintf("failed to get storage: %v", err),
-		}
-	}
+	store := s.storage
 
 	sqliteStore, ok := store.(*sqlite.SQLiteStorage)
 	if !ok {