refactor(core): codebase quality cleanup

- Remove user-level model settings (chat_model_id, memory_model_id,
  embedding_model_id, max_context_load_time, language) from users table
- Merge migration 0002 into 0001, remove compatibility migrations
- Delete dead conversation/resolver.go (1177 lines, only flow/resolver.go used)
- Remove type aliases (Chat=Conversation, types_alias.go)
- Fix SQL: remove AND false stub, fix UpdateChatTitle model_id,
  reset model IDs in DeleteSettings, add preauth expiry filter,
  add ListMessages limit, remove 10 dead queries
- Extract shared handler helpers (RequireChannelIdentityID, AuthorizeBotAccess)
- Rename internal/router to internal/channel/inbound
- Fix identity confusion: remove UserID->ChannelIdentityID fallbacks
- Fix all _ = var patterns with proper error logging
- Fix error propagation: storeMessages, rescheduleJob, botContainerID
- Fix naming: ModelId->ModelID, active->is_active, Duration semantic fix
- Remove dead code: mcpService, ReplyTarget, callMCPServer, sshShellQuote,
  buildSessionMetadata, ChatRequest.Language, TriggerPayload.ChatID
- Fix code quality: errors.Is(), remove goto, CreateHuman deprecated
- Remove Enable model endpoint and user-level settings CLI commands
- Regenerate sqlc, swagger, SDK

internal/db/sqlc/events.sql.go

@@ -35,33 +35,3 @@ func (q *Queries) InsertLifecycleEvent(ctx context.Context, arg InsertLifecycleE
 	)
 	return err
 }
-
-const listLifecycleEventsByContainerID = `-- name: ListLifecycleEventsByContainerID :many
-SELECT id, container_id, event_type, payload, created_at FROM lifecycle_events WHERE container_id = $1 ORDER BY created_at ASC
-`
-
-func (q *Queries) ListLifecycleEventsByContainerID(ctx context.Context, containerID string) ([]LifecycleEvent, error) {
-	rows, err := q.db.Query(ctx, listLifecycleEventsByContainerID, containerID)
-	if err != nil {
-		return nil, err
-	}
-	defer rows.Close()
-	var items []LifecycleEvent
-	for rows.Next() {
-		var i LifecycleEvent
-		if err := rows.Scan(
-			&i.ID,
-			&i.ContainerID,
-			&i.EventType,
-			&i.Payload,
-			&i.CreatedAt,
-		); err != nil {
-			return nil, err
-		}
-		items = append(items, i)
-	}
-	if err := rows.Err(); err != nil {
-		return nil, err
-	}
-	return items, nil
-}