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/api/handler/owners.go

@@ -1,6 +1,7 @@
 package handler
 
 import (
+	"context"
 	"encoding/json"
 	"net/http"
 	"strconv"
@@ -12,11 +13,11 @@ import (
 
 // OwnerService defines the service interface for owner operations.
 type OwnerService interface {
-	ListOwners(page, perPage int) ([]domain.Owner, int64, error)
-	GetOwner(id string) (*domain.Owner, error)
-	CreateOwner(owner domain.Owner) (*domain.Owner, error)
-	UpdateOwner(id string, owner domain.Owner) (*domain.Owner, error)
-	DeleteOwner(id string) error
+	ListOwners(ctx context.Context, page, perPage int) ([]domain.Owner, int64, error)
+	GetOwner(ctx context.Context, id string) (*domain.Owner, error)
+	CreateOwner(ctx context.Context, owner domain.Owner) (*domain.Owner, error)
+	UpdateOwner(ctx context.Context, id string, owner domain.Owner) (*domain.Owner, error)
+	DeleteOwner(ctx context.Context, id string) error
 }
 
 // OwnerHandler handles HTTP requests for owner operations.
@@ -53,7 +54,7 @@ func (h OwnerHandler) ListOwners(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
-	owners, total, err := h.svc.ListOwners(page, perPage)
+	owners, total, err := h.svc.ListOwners(r.Context(), page, perPage)
 	if err != nil {
 		ErrorWithRequestID(w, http.StatusInternalServerError, "Failed to list owners", requestID)
 		return
@@ -87,7 +88,7 @@ func (h OwnerHandler) GetOwner(w http.ResponseWriter, r *http.Request) {
 	}
 	id = parts[0]
 
-	owner, err := h.svc.GetOwner(id)
+	owner, err := h.svc.GetOwner(r.Context(), id)
 	if err != nil {
 		ErrorWithRequestID(w, http.StatusNotFound, "Owner not found", requestID)
 		return
@@ -122,7 +123,7 @@ func (h OwnerHandler) CreateOwner(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	created, err := h.svc.CreateOwner(owner)
+	created, err := h.svc.CreateOwner(r.Context(), owner)
 	if err != nil {
 		ErrorWithRequestID(w, http.StatusInternalServerError, "Failed to create owner", requestID)
 		return
@@ -155,7 +156,7 @@ func (h OwnerHandler) UpdateOwner(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	updated, err := h.svc.UpdateOwner(id, owner)
+	updated, err := h.svc.UpdateOwner(r.Context(), id, owner)
 	if err != nil {
 		ErrorWithRequestID(w, http.StatusInternalServerError, "Failed to update owner", requestID)
 		return
@@ -182,7 +183,7 @@ func (h OwnerHandler) DeleteOwner(w http.ResponseWriter, r *http.Request) {
 	}
 	id = parts[0]
 
-	if err := h.svc.DeleteOwner(id); err != nil {
+	if err := h.svc.DeleteOwner(r.Context(), id); err != nil {
 		if strings.Contains(err.Error(), "violates foreign key") || strings.Contains(err.Error(), "RESTRICT") {
 			ErrorWithRequestID(w, http.StatusConflict, "Cannot delete owner: certificates are still assigned to this owner", requestID)
 		} else if strings.Contains(err.Error(), "not found") {