fix(inspur): match main board FRU on word boundary

A bare "board" substring test let compound module names like
"FANBOARD0_FRU" qualify as the main system board, overwriting the
real board info with fan-board serial/part numbers. Switch to a
word-boundary regex.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

internal/parser/vendors/inspur/fru_test.go

@@ -32,6 +32,36 @@ func TestExtractBoardInfo_PreservesBuiltinSerial(t *testing.T) {
 	}
 }
 
+func TestExtractBoardInfo_FanBoardIsNotMainBoard(t *testing.T) {
+	hw := &models.HardwareConfig{}
+	fruList := []models.FRUInfo{
+		{
+			Description:  "SCM_FRU (ID 8)",
+			SerialNumber: "CAR517GN0377A01",
+			ProductName:  "CA",
+			PartNumber:   "YZCA-04672-101",
+		},
+		{
+			Description:  "FANBOARD0_FRU (ID 64)",
+			SerialNumber: "CFR517G80024A01",
+			ProductName:  "CF",
+			PartNumber:   "YZCF-04669-101",
+		},
+	}
+
+	extractBoardInfo(fruList, hw)
+
+	if hw.BoardInfo.ProductName != "CA" {
+		t.Fatalf("expected product name CA, got %q", hw.BoardInfo.ProductName)
+	}
+	if hw.BoardInfo.PartNumber != "YZCA-04672-101" {
+		t.Fatalf("expected part number YZCA-04672-101, got %q", hw.BoardInfo.PartNumber)
+	}
+	if hw.BoardInfo.SerialNumber != "CAR517GN0377A01" {
+		t.Fatalf("expected serial CAR517GN0377A01, got %q", hw.BoardInfo.SerialNumber)
+	}
+}
+
 func TestExtractBoardInfo_DoesNotUsePSUVendorAsBoardManufacturer(t *testing.T) {
 	hw := &models.HardwareConfig{}
 	fruList := []models.FRUInfo{