feat(contacts): channel contacts table, auto-collector, contacts page & managers tab redesign

- Add channel_contacts migration (000014) with UNIQUE(channel_type, sender_id)
- Add ContactStore interface with UPSERT, list, count, merge operations
- Add ContactCollector with 30-min TTL cache to skip redundant DB writes
- Wire auto-collection into gateway consumer on every inbound message
- Add GET /v1/contacts API with pagination, search, channel_type & peer_kind filters
- Rename Writers tab → Managers tab (UI-only; backend routes unchanged)
- Extract InlineAddForm with scoped state, debounce cleanup, aria-expanded
- Add Combobox contact picker with debounced search + auto-fill
- Add Contacts page with server-side pagination, filters, i18n (en/vi/zh)
- Add shared ChannelContact type, sidebar nav entry, route & query keys
- Fix ILIKE wildcard escape, log CountContacts errors, extract shared type

cmd/gateway_consumer.go

@@ -26,7 +26,7 @@ import (
 // and routes them through the scheduler/agent loop, then publishes the response back.
 // Also handles subagent announcements: routes them through the parent agent's session
 // (matching TS subagent-announce.ts pattern) so the agent can reformulate for the user.
-func consumeInboundMessages(ctx context.Context, msgBus *bus.MessageBus, agents *agent.Router, cfg *config.Config, sched *scheduler.Scheduler, channelMgr *channels.Manager, teamStore store.TeamStore, quotaChecker *channels.QuotaChecker, delegateMgr *tools.DelegateManager, sessStore store.SessionStore, agentStore store.AgentStore) {
+func consumeInboundMessages(ctx context.Context, msgBus *bus.MessageBus, agents *agent.Router, cfg *config.Config, sched *scheduler.Scheduler, channelMgr *channels.Manager, teamStore store.TeamStore, quotaChecker *channels.QuotaChecker, delegateMgr *tools.DelegateManager, sessStore store.SessionStore, agentStore store.AgentStore, contactCollector *store.ContactCollector) {
 	slog.Info("inbound message consumer started")
 
 	// Inbound message deduplication (matching TS src/infra/dedupe.ts + inbound-dedupe.ts).
@@ -110,7 +110,8 @@ func consumeInboundMessages(ctx context.Context, msgBus *bus.MessageBus, agents
 		}
 
 		// Persist friendly names from channel metadata into session + user profile.
-		if sessionMeta := extractSessionMetadata(msg, peerKind); len(sessionMeta) > 0 {
+		sessionMeta := extractSessionMetadata(msg, peerKind)
+		if len(sessionMeta) > 0 {
 			sessStore.SetSessionMetadata(sessionKey, sessionMeta)
 			if agentStore != nil {
 				if agentUUID, err := uuid.Parse(agentID); err == nil && agentUUID != uuid.Nil {
@@ -119,6 +120,21 @@ func consumeInboundMessages(ctx context.Context, msgBus *bus.MessageBus, agents
 			}
 		}
 
+		// Auto-collect channel contacts for the contact selector.
+		if contactCollector != nil && msg.SenderID != "" {
+			senderNumericID := msg.SenderID
+			if idx := strings.IndexByte(senderNumericID, '|'); idx > 0 {
+				senderNumericID = senderNumericID[:idx]
+			}
+			channelType := channelMgr.ChannelTypeForName(msg.Channel)
+			if channelType == "" {
+				channelType = msg.Channel // fallback to instance name
+			}
+			displayName := sessionMeta["display_name"]
+			username := sessionMeta["username"]
+			contactCollector.EnsureContact(ctx, channelType, msg.Channel, senderNumericID, userID, displayName, username, peerKind)
+		}
+
 		// --- Quota check ---
 		if quotaChecker != nil {
 			qResult := quotaChecker.Check(ctx, userID, msg.Channel, agentLoop.ProviderName())

cmd/gateway_http_handlers.go

@@ -52,7 +52,7 @@ func wireHTTP(stores *store.Stores, token string, msgBus *bus.MessageBus, toolsR
 	}
 
 	if stores != nil && stores.ChannelInstances != nil {
-		channelInstancesH = httpapi.NewChannelInstancesHandler(stores.ChannelInstances, stores.Agents, token, msgBus)
+		channelInstancesH = httpapi.NewChannelInstancesHandler(stores.ChannelInstances, stores.Agents, stores.Contacts, token, msgBus)
 	}
 
 	if stores != nil && stores.Providers != nil {