feat(repository): refactor query/mutation ports with capability-safe

interfaces

- refactor: split UserRepository into AuthUserRepository and
  AdminUserRepository capabilities
- refactor: split SessionRepository into AuthSessionRepository and
  repository-owned CLI/admin methods
- refactor: replace generic Repository Update/Delete with
  operation-specific params and ownership predicates
- refactor: replace CredentialRepository generic CRUD with
  passkey-specific methods
- refactor: replace FileRepository generic Create/Update/Delete with
  UploadedFileParams, DirectoryParams, and owned soft-delete
- refactor: remove repository fields from WebApp struct; repositories
  are now composition-time wiring only
- feat: add domain error kinds ErrParentNotFound, ErrParentNotDir,
  ErrDirectoryNotEmpty, ErrInvalidMove
- feat: add CredentialTypeAppPasskey constant
- feat: add testutil.SetUserAdmin for test fixture setup that bypasses
  production service ports
- test: add architecture test banning GORM Save in repository package
- test: add capability interface contract tests ensuring each service
  receives the minimal interface
- test: add blockingStorage helper for concurrent promotion tests
- test: add preserved DSN parameter test for sqliteImmediateDSN
- docs: update architecture decisions with repository write rules and
  capability separation
- docs: update roadmap to clarify atomic single-use refresh sessions
- docs: add -race test target to development docs

internal/server/server_test.go

@@ -2,7 +2,6 @@ package server
 
 import (
 	"bytes"
-	"context"
 	"encoding/json"
 	"net/http"
 	"net/http/httptest"
@@ -14,6 +13,7 @@ import (
 	"github.com/dhao2001/mygo/internal/config"
 	"github.com/dhao2001/mygo/internal/repository"
 	"github.com/dhao2001/mygo/internal/service"
+	"github.com/dhao2001/mygo/internal/testutil"
 )
 
 func TestVersionRoute(t *testing.T) {
@@ -25,7 +25,7 @@ func TestVersionRoute(t *testing.T) {
 		},
 	}
 	authService := service.NewAuthService(nil, nil, nil, nil, 15*time.Minute, 7*24*time.Hour)
-	webApp := app.NewWebApp(cfg, nil, nil, nil, nil, nil, authService, nil, nil, nil)
+	webApp := app.NewWebApp(cfg, nil, authService, nil, nil, nil)
 	router := NewRouter(webApp)
 
 	req := httptest.NewRequest(http.MethodGet, "/api/v1/version", nil)
@@ -94,7 +94,7 @@ func TestAdminRoutes(t *testing.T) {
 		},
 	}
 
-	webApp := app.NewWebApp(cfg, db, userRepo, sessionRepo, nil, credentialRepo, authService, adminService, nil, nil)
+	webApp := app.NewWebApp(cfg, db, authService, adminService, nil, nil)
 	router := NewRouter(webApp)
 
 	// Helper: register a user via POST /api/v1/auth/register and return the user ID.
@@ -123,14 +123,7 @@ func TestAdminRoutes(t *testing.T) {
 
 	// Register admin user and promote to admin.
 	adminID := register("admin", "admin@test.local", "adminpass1")
-	adminUser, err := userRepo.FindByID(context.Background(), adminID)
-	if err != nil {
-		t.Fatalf("find admin user: %v", err)
-	}
-	adminUser.IsAdmin = true
-	if err := userRepo.Update(context.Background(), adminUser); err != nil {
-		t.Fatalf("promote to admin: %v", err)
-	}
+	testutil.SetUserAdmin(t, db, adminID, true)
 
 	// Generate admin JWT.
 	adminToken, err := auth.GenerateAccessToken(adminID, jwtSecret, accessTTL)