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_test.go

@@ -638,7 +638,7 @@ func TestOwnerService_ListOwners_HandlerInterface(t *testing.T) {
 
 	ownerService := NewOwnerService(ownerRepo, auditService)
 
-	owners, total, err := ownerService.ListOwners(1, 50)
+	owners, total, err := ownerService.ListOwners(context.Background(), 1, 50)
 	if err != nil {
 		t.Fatalf("ListOwners failed: %v", err)
 	}
@@ -678,7 +678,7 @@ func TestOwnerService_GetOwner_HandlerInterface(t *testing.T) {
 
 	ownerService := NewOwnerService(ownerRepo, auditService)
 
-	retrieved, err := ownerService.GetOwner("owner-001")
+	retrieved, err := ownerService.GetOwner(context.Background(), "owner-001")
 	if err != nil {
 		t.Fatalf("GetOwner failed: %v", err)
 	}
@@ -702,7 +702,7 @@ func TestOwnerService_CreateOwner_HandlerInterface(t *testing.T) {
 		TeamID: "team-001",
 	}
 
-	created, err := ownerService.CreateOwner(owner)
+	created, err := ownerService.CreateOwner(context.Background(), owner)
 	if err != nil {
 		t.Fatalf("CreateOwner failed: %v", err)
 	}
@@ -752,7 +752,7 @@ func TestOwnerService_UpdateOwner_HandlerInterface(t *testing.T) {
 		TeamID: "team-002",
 	}
 
-	updated, err := ownerService.UpdateOwner("owner-001", updatedOwner)
+	updated, err := ownerService.UpdateOwner(context.Background(), "owner-001", updatedOwner)
 	if err != nil {
 		t.Fatalf("UpdateOwner failed: %v", err)
 	}
@@ -798,7 +798,7 @@ func TestOwnerService_DeleteOwner_HandlerInterface(t *testing.T) {
 
 	ownerService := NewOwnerService(ownerRepo, auditService)
 
-	err := ownerService.DeleteOwner("owner-001")
+	err := ownerService.DeleteOwner(context.Background(), "owner-001")
 	if err != nil {
 		t.Fatalf("DeleteOwner failed: %v", err)
 	}