feat(subscription): temporarily disable subscription gating

Subscriptions aren't a shipping feature for now. Make
GET /api/subscription/status/ return a "limitations disabled" / pro-tier
stub at the top of the function with no DB or Redis work:

  - tier="pro"
  - is_active=true
  - limitations_enabled=false  (master kill switch in SubscriptionHelper.kt;
                                every canCreate* check short-circuits true)
  - usage=0 across the board
  - limits map present with empty entries (all-nil = unlimited per the KMM
    model convention) so client tier-lookups don't NPE

The original implementation is preserved verbatim as the unexported
getSubscriptionStatusFromDB method. Re-enabling is a one-line change:
swap GetSubscriptionStatus's body to call s.getSubscriptionStatusFromDB.

Two integration tests in subscription_is_free_test.go assert the original
"limitations actually apply based on settings/IsFree" behavior. They now
t.Skip with the same TEMPORARILY DISABLED marker pointing back to the
service comment. CheckLimit-based tests in the same file still pass
because that codepath is unchanged.

Perf side effect: POST/GET on this route drops to ~1ms (just JSON marshal),
removing 4-5 serial Neon RTTs from every cold call. Was the slowest endpoint
in the live dashboard (~213ms p95 / ~480ms after the pod roll).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

internal/services/subscription_service.go

@@ -121,7 +121,51 @@ func (s *SubscriptionService) GetSubscription(ctx context.Context, userID uint)
 // 5-minute TTL; mutation paths (residence/task/contractor/document/sub CRUD)
 // invalidate via cache.InvalidateSubscriptionStatusForUsers, fanning out to
 // every member of a shared residence.
-func (s *SubscriptionService) GetSubscriptionStatus(ctx context.Context, userID uint) (*SubscriptionStatusResponse, error) {
+//
+// TEMPORARILY DISABLED — Subscriptions feature off.
+//
+// Returns a "limitations disabled" / pro-tier stub without any DB or Redis
+// work. The KMM client (SubscriptionHelper.kt) treats limitations_enabled=false
+// as a master kill switch — every canCreate* check short-circuits to true
+// without ever consulting tier or limits. tier="pro" is belt-and-suspenders in
+// case a future client path inspects tier directly.
+//
+// To re-enable: change this body to call s.getSubscriptionStatusFromDB(ctx, userID).
+// The original implementation is preserved verbatim below as an unexported
+// method so this is a one-line revert.
+//
+// Findable by searching: "TEMPORARILY DISABLED — Subscriptions"
+func (s *SubscriptionService) GetSubscriptionStatus(ctx context.Context, _ uint) (*SubscriptionStatusResponse, error) {
+	_ = ctx
+	return &SubscriptionStatusResponse{
+		Tier:               "pro",
+		IsActive:           true,
+		AutoRenew:          false,
+		LimitationsEnabled: false,
+		Usage: &UsageResponse{
+			PropertiesCount:  0,
+			TasksCount:       0,
+			ContractorsCount: 0,
+			DocumentsCount:   0,
+		},
+		Limits: map[string]*TierLimitsClientResponse{
+			// Empty TierLimitsClientResponse → all fields nil → "unlimited"
+			// per the KMM model's `null = unlimited` convention. Keys present
+			// so client Map[tier] lookups don't NPE if they ever run.
+			"free": {},
+			"pro":  {},
+		},
+		SubscriptionSource: "none",
+		TrialActive:        false,
+	}, nil
+}
+
+// getSubscriptionStatusFromDB is the original implementation, preserved verbatim
+// while the subscription feature is disabled. See the TEMPORARILY DISABLED note
+// on GetSubscriptionStatus above for the re-enable procedure.
+//
+//nolint:unused // intentional — re-enabled by switching GetSubscriptionStatus to call this.
+func (s *SubscriptionService) getSubscriptionStatusFromDB(ctx context.Context, userID uint) (*SubscriptionStatusResponse, error) {
 	// Cache fast path — only used on warm reads. Cold reads, trial-start
 	// branch, and the actual mutation paths below all populate fresh.
 	if s.cache != nil {