feat: surface BMC collection errors in parse-errors panel and event log

When Inspur component.log sections return {"error":"...","code":N} instead
of hardware data, the parser now:
- stores them in AnalysisResult.CollectionErrors (new model field)
- mirrors each one into result.Events with Source="BMC/<section>"
  so the chart viewer event table shows the specific BMC module
- feeds them into /api/parse-errors as bmc_collection_error entries

UI adds a collapsible "Collection diagnostics" panel below the chart
iframe (outside /chart) that appears when /api/parse-errors returns
any items; resets on data clear.

Affected sections in this dump: HDD (1458), PCIe Devices (1458),
Network Adapters (1458), Disk Backplane.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/models/models.go

@@ -16,11 +16,21 @@ type AnalysisResult struct {
 	SourceTimezone string          `json:"source_timezone,omitempty"` // Source timezone/offset used during collection (e.g. +08:00)
 	CollectedAt              time.Time       `json:"collected_at,omitempty"`               // Collection/upload timestamp
 	InventoryLastModifiedAt  time.Time       `json:"inventory_last_modified_at,omitempty"` // Redfish inventory last modified (InventoryData/Status)
-	RawPayloads    map[string]any  `json:"raw_payloads,omitempty"`    // Additional source payloads (e.g. Redfish tree)
-	Events         []Event         `json:"events"`
-	FRU            []FRUInfo       `json:"fru"`
-	Sensors        []SensorReading `json:"sensors"`
-	Hardware       *HardwareConfig `json:"hardware"`
+	RawPayloads      map[string]any   `json:"raw_payloads,omitempty"`      // Additional source payloads (e.g. Redfish tree)
+	CollectionErrors []CollectionError `json:"collection_errors,omitempty"` // BMC-reported failures to collect specific sections
+	Events           []Event           `json:"events"`
+	FRU              []FRUInfo         `json:"fru"`
+	Sensors          []SensorReading   `json:"sensors"`
+	Hardware         *HardwareConfig   `json:"hardware"`
+}
+
+// CollectionError represents a BMC-reported failure to collect a specific data section.
+// Populated by vendor parsers when the source explicitly returns an error response
+// instead of structured data (e.g. {"error":"...","code":1458} in Inspur component.log).
+type CollectionError struct {
+	Section string `json:"section"`
+	Message string `json:"message"`
+	Code    int    `json:"code,omitempty"`
 }
 
 // Event represents a single log event