refactor(web): remove deprecated dashboard components and enhance KPI grid

- Deleted unused components: `DashboardActivityTimeline`, `DashboardFramePanel`, `DashboardModulesGrid`, `DashboardRecentJobsGrid`, and `DashboardRecentRevisionsGrid` to streamline the dashboard.
- Updated `DashboardKpiGrid` to improve KPI display logic, including progress indicators and enhanced badge functionality.
- Refactored `DashboardNetworkHealth` to provide better status representation based on loading states and network conditions.
- Introduced new properties for KPI cards to support progress tracking and improved visual feedback.

This cleanup aims to enhance performance and maintainability of the dashboard while providing a better user experience.

internal/store/backend.go

@@ -116,11 +116,19 @@ type Backend interface {
 	GetModulePrefixSnapshot(tenantID, moduleID string) (*ModulePrefixSnapshot, bool, error)
 	SetModulePrefixSnapshot(tenantID, moduleID, inputHash string, prefixes []PrefixRow) error
 	DeleteModulePrefixSnapshot(tenantID, moduleID string) error
+	// SetModuleInputHash stores the ingest fingerprint on the module row (O(1) snapshot check).
+	SetModuleInputHash(tenantID, moduleID, hash string) error
+	// LockModuleSnapshot serializes read-modify-write of one module snapshot; unlock must be called.
+	LockModuleSnapshot(tenantID, moduleID string) (unlock func())
 
 	// ASNPrefixCache stores RIPEstat announced-prefixes per ASN (global TTL cache).
 	GetASNPrefixCache(asn int64) (*ASNPrefixCacheEntry, bool, error)
 	SetASNPrefixCache(asn int64, holder string, prefixes []string) error
 
+	// DomainResolveCache stores DoH results per FQDN (global TTL cache).
+	GetDomainResolveCache(fqdn string) (*DomainResolveCacheEntry, bool, error)
+	SetDomainResolveCache(fqdn string, addrs []string) error
+
 	// Ping verifies backend connectivity (no-op for in-memory).
 	Ping(ctx context.Context) error
 
@@ -178,6 +186,13 @@ type ASNPrefixCacheEntry struct {
 	FetchedAt time.Time
 }
 
+// DomainResolveCacheEntry is a cached DoH A/AAAA result for one FQDN.
+type DomainResolveCacheEntry struct {
+	FQDN       string
+	Addrs      []string
+	ResolvedAt time.Time
+}
+
 // ModulePrefixSnapshot is the cached materialization for one module between refreshes.
 type ModulePrefixSnapshot struct {
 	InputHash   string