Add live routing table with CIDR mask length tracking

- Added new live_routes table with mask_length column for tracking CIDR prefix lengths
- Updated PrefixHandler to maintain live routing table with additions and deletions
- Added route expiration functionality (5 minute timeout) to in-memory routing table
- Added prefix distribution stats showing count of prefixes by mask length
- Added IPv4/IPv6 prefix distribution cards to status page
- Updated database interface with UpsertLiveRoute, DeleteLiveRoute, and GetPrefixDistribution
- Set all handler queue depths to 50000 for consistency
- Doubled DBHandler batch size to 32000 for better throughput
- Fixed withdrawal handling to delete routes when origin ASN is available

internal/database/models.go

@@ -45,3 +45,22 @@ type ASNPeering struct {
 	FirstSeen time.Time `json:"first_seen"`
 	LastSeen  time.Time `json:"last_seen"`
 }
+
+// LiveRoute represents a route in the live routing table
+type LiveRoute struct {
+	ID          uuid.UUID `json:"id"`
+	Prefix      string    `json:"prefix"`
+	MaskLength  int       `json:"mask_length"`
+	IPVersion   int       `json:"ip_version"`
+	OriginASN   int       `json:"origin_asn"`
+	PeerIP      string    `json:"peer_ip"`
+	ASPath      []int     `json:"as_path"`
+	NextHop     string    `json:"next_hop"`
+	LastUpdated time.Time `json:"last_updated"`
+}
+
+// PrefixDistribution represents the distribution of prefixes by mask length
+type PrefixDistribution struct {
+	MaskLength int `json:"mask_length"`
+	Count      int `json:"count"`
+}