M-2 PR-C: Collapse Policy/Profile/Owner/Team services to ctx-first signatures

- Add ctx first param to 21 service-layer handler-interface methods
  across policy.go (6), profile.go (5), owner.go (5), team.go (5)
- Replace 24 context.Background() call sites with received ctx; use
  context.WithoutCancel(ctx) for subsidiary audit-recording ops to
  preserve fire-and-forget audit semantics without inheriting caller
  cancellation
- Add ctx first param to 21 handler-interface method signatures across
  policies.go (6), profiles.go (5), owners.go (5), teams.go (5)
- Thread r.Context() through 21 HTTP handler sites (ListPolicies,
  GetPolicy, CreatePolicy, UpdatePolicy, DeletePolicy, ListViolations,
  ListProfiles, GetProfile, CreateProfile, UpdateProfile, DeleteProfile,
  ListOwners, GetOwner, CreateOwner, UpdateOwner, DeleteOwner,
  ListTeams, GetTeam, CreateTeam, UpdateTeam, DeleteTeam)
- Update MockPolicyService/MockProfileService/MockOwnerService/
  MockTeamService mock method impls with _ context.Context first param
  (Fn fields unchanged — closures do not need ctx); update mock impls
  in integration/lifecycle_test.go for all four services
- Update 12 service-layer test callsites (policy_test.go ×2,
  owner_test.go ×5, team_test.go ×5, profile_test.go ×13) to pass
  context.Background() at the call site

Audit complete. Commit: 855124a9d9. Sections: 12. Findings: 2/7/10/4/6.

internal/service/owner.go

@@ -126,7 +126,7 @@ func (s *OwnerService) Delete(ctx context.Context, id string, actor string) erro
 }
 
 // ListOwners returns paginated owners (handler interface method).
-func (s *OwnerService) ListOwners(page, perPage int) ([]domain.Owner, int64, error) {
+func (s *OwnerService) ListOwners(ctx context.Context, page, perPage int) ([]domain.Owner, int64, error) {
 	if page < 1 {
 		page = 1
 	}
@@ -134,7 +134,7 @@ func (s *OwnerService) ListOwners(page, perPage int) ([]domain.Owner, int64, err
 		perPage = 50
 	}
 
-	owners, err := s.ownerRepo.List(context.Background())
+	owners, err := s.ownerRepo.List(ctx)
 	if err != nil {
 		return nil, 0, fmt.Errorf("failed to list owners: %w", err)
 	}
@@ -151,12 +151,12 @@ func (s *OwnerService) ListOwners(page, perPage int) ([]domain.Owner, int64, err
 }
 
 // GetOwner returns a single owner (handler interface method).
-func (s *OwnerService) GetOwner(id string) (*domain.Owner, error) {
-	return s.ownerRepo.Get(context.Background(), id)
+func (s *OwnerService) GetOwner(ctx context.Context, id string) (*domain.Owner, error) {
+	return s.ownerRepo.Get(ctx, id)
 }
 
 // CreateOwner creates a new owner (handler interface method).
-func (s *OwnerService) CreateOwner(owner domain.Owner) (*domain.Owner, error) {
+func (s *OwnerService) CreateOwner(ctx context.Context, owner domain.Owner) (*domain.Owner, error) {
 	if owner.ID == "" {
 		owner.ID = generateID("owner")
 	}
@@ -167,22 +167,22 @@ func (s *OwnerService) CreateOwner(owner domain.Owner) (*domain.Owner, error) {
 	if owner.UpdatedAt.IsZero() {
 		owner.UpdatedAt = now
 	}
-	if err := s.ownerRepo.Create(context.Background(), &owner); err != nil {
+	if err := s.ownerRepo.Create(ctx, &owner); err != nil {
 		return nil, fmt.Errorf("failed to create owner: %w", err)
 	}
 	return &owner, nil
 }
 
 // UpdateOwner modifies an owner (handler interface method).
-func (s *OwnerService) UpdateOwner(id string, owner domain.Owner) (*domain.Owner, error) {
+func (s *OwnerService) UpdateOwner(ctx context.Context, id string, owner domain.Owner) (*domain.Owner, error) {
 	owner.ID = id
-	if err := s.ownerRepo.Update(context.Background(), &owner); err != nil {
+	if err := s.ownerRepo.Update(ctx, &owner); err != nil {
 		return nil, fmt.Errorf("failed to update owner: %w", err)
 	}
 	return &owner, nil
 }
 
 // DeleteOwner removes an owner (handler interface method).
-func (s *OwnerService) DeleteOwner(id string) error {
-	return s.ownerRepo.Delete(context.Background(), id)
+func (s *OwnerService) DeleteOwner(ctx context.Context, id string) error {
+	return s.ownerRepo.Delete(ctx, id)
 }