feat(firewall): implement firewall blocklist feature with client management and policy rules

Introduced a comprehensive firewall blocklist feature, allowing for the management of firewall clients and their associated rules. This includes endpoints for enrolling clients, listing clients and rules, and reporting apply statuses. Enhanced the API to support firewall operations, including the ability to handle block/accept policies. Updated the documentation to reflect these changes and added necessary components in the web UI for better user interaction.

Additionally, modified the agent server to support firewall failover and integrated firewall functionality into the existing architecture.

internal/store/backend.go

@@ -131,6 +131,28 @@ type Backend interface {
 	// Runtime log cleanup audit (filesystem ops logged per tenant).
 	AppendRuntimeLogCleanupAudit(tenantID, actor, filename, action string, sizeBefore int64, sizeAfter *int64, detail map[string]any) (string, error)
 	ListRuntimeLogCleanupAudit(tenantID, cursor string, limit int) ([]*RuntimeLogCleanupAudit, string, bool, error)
+
+	// Firewall blocklist clients and policy rules.
+	ListFirewallClients(tenantID string) ([]*FirewallClient, error)
+	GetFirewallClient(tenantID, id string) (*FirewallClient, error)
+	CreateFirewallClient(tenantID string, in *FirewallClientCreate) (*FirewallClient, error)
+	UpdateFirewallClient(tenantID, id string, patch *FirewallClientPatch) (*FirewallClient, error)
+	ApproveFirewallClient(tenantID, id, approverAPIKeyID string) (*FirewallClient, error)
+	RevokeFirewallClient(tenantID, id string) error
+	DeleteFirewallClient(tenantID, id string) error
+	LookupFirewallClientByTokenHash(hash []byte) (*FirewallClient, error)
+	TouchFirewallClientLastSeen(id, source, clientIP, clientVersion string) error
+	TouchFirewallClientLastApply(id, source, status, errMsg string, prefixCount, ipCount int) error
+	ListActiveFirewallClientHashes() ([]FirewallClientAuthRow, error)
+	ListApprovedFirewallClientsForReplication(tenantID string) ([]FirewallClientReplicationRow, error)
+
+	ListFirewallRules(tenantID string, clientID *string) ([]*FirewallRule, error)
+	ListAllFirewallRulesForClient(tenantID, clientID string) ([]*FirewallRule, error)
+	ListAllFirewallRulesForReplication(tenantID string) ([]*FirewallRule, error)
+	CreateFirewallRule(tenantID string, clientID *string, in *FirewallRuleCreate) (*FirewallRule, error)
+	UpdateFirewallRule(tenantID, ruleID string, patch *FirewallRulePatch) (*FirewallRule, error)
+	DeleteFirewallRule(tenantID, ruleID string) error
+	ReorderFirewallRules(tenantID string, clientID *string, orderedIDs []string) error
 }
 
 // ASNPrefixCacheEntry is a cached RIPEstat response for one ASN.