refactor: remove service factory wrappers, call store init methods directly

Replace InitNodeService/GetNodeService/GetNodeServiceForUser with thin
NewLocalNodeService/NewRemoteNodeService constructors; move wiring logic
into cmd/root.go (getNodeService helper) and an inline closure in serve.go.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/service/node_service.go

@@ -3,7 +3,6 @@ package service
 import (
 	"axolotl/models"
 	"axolotl/store"
-	"fmt"
 	"net/http"
 )
 
@@ -12,7 +11,6 @@ import (
 // invalid state by interacting with this interface alone.
 //
 // Every NodeService instance is bound to a specific user (see User()).
-// GetNodeService returns an error when no user is configured.
 type NodeService interface {
 	// User returns the name/ID of the user this service instance acts on behalf of.
 	User() string
@@ -68,33 +66,10 @@ type RelInput struct {
 	Target string // name or node ID; the service resolves names. Empty = tag rel.
 }
 
-func InitNodeService(path string) error {
-	return store.InitSQLiteStore(path)
+func NewLocalNodeService(st store.GraphStore, user string) NodeService {
+	return &nodeServiceImpl{store: st, userID: user}
 }
 
-func GetNodeService(cfg *store.Config) (NodeService, error) {
-	user := cfg.GetUser()
-	if user == "" {
-		return nil, fmt.Errorf("no user configured: run 'ax user set <username>' first")
-	}
-	if rc, ok := cfg.GetRemoteConfig(); ok {
-		base := fmt.Sprintf("http://%s:%d", rc.Host, rc.Port)
-		return &apiClient{base: base, user: user, http: &http.Client{}}, nil
-	}
-	st, err := store.FindAndOpenSQLiteStore()
-	if err != nil {
-		return nil, err
-	}
-	return &nodeServiceImpl{store: st, userID: user}, nil
-}
-
-func GetNodeServiceForUser(user string) (NodeService, error) {
-	if user == "" {
-		return nil, fmt.Errorf("user is required")
-	}
-	st, err := store.FindOrInitSQLiteStore()
-	if err != nil {
-		return nil, err
-	}
-	return &nodeServiceImpl{store: st, userID: user}, nil
+func NewRemoteNodeService(base, user string) NodeService {
+	return &apiClient{base: base, user: user, http: &http.Client{}}
 }