feat(cycle): user-defined custom symptoms

Mirror the v1.13 custom-mood-tag CRUD for cycle symptoms. A user can mint
their own symptoms beyond the 15 seeded ones, picked from a label + icon
popover via a dashed ghost-chip in the log-day sheet's symptom grid.

- POST/GET /api/cycle/symptoms/custom and PATCH/DELETE on /[key]: mint a
  custom:<uuid> key, encrypt the free-text label at rest (AES-256-GCM),
  per-user cap, owner-scoped, gated behind requireCycleEnabled. Soft-hide by
  default, hard-purge on ?purge=true.
- The day-log write already resolves a symptom key against the catalogue plus
  the caller's own rows, so a custom: key links by construction.
- The log-day sheet fetches the user's customs and merges them under a new
  custom category in the chip grid; the ghost-chip + popover reuse the chip
  styling and the Lucide icon set.
- Seed the global custom symptom category (migration 0134).
- The purge route (DELETE /api/cycle/all) now drops the user's custom symptom
  rows too, so no intent-revealing label survives a purge.
- The label is never logged: only the icon + counts reach annotate/auditLog.
- i18n: cycle.symptom.custom.* across all six locales.

messages/de.json

@@ -4903,7 +4903,8 @@
     "symptomCategory": {
       "physical": "Körperlich",
       "emotional": "Emotional",
-      "digestive": "Verdauung"
+      "digestive": "Verdauung",
+      "custom": "Eigene"
     },
     "symptom": {
       "cramps": "Krämpfe",
@@ -4920,7 +4921,16 @@
       "foodCravings": "Heißhunger",
       "nausea": "Übelkeit",
       "diarrhea": "Durchfall",
-      "constipation": "Verstopfung"
+      "constipation": "Verstopfung",
+      "custom": {
+        "add": "Symptom hinzufügen",
+        "label": "Name",
+        "labelPlaceholder": "z. B. Schwindel",
+        "icon": "Symbol",
+        "limitReached": "Höchstzahl an eigenen Symptomen erreicht.",
+        "remove": "{label} entfernen",
+        "fallbackLabel": "Eigenes Symptom"
+      }
     },
     "prediction": {
       "disclaimer": "Vorhersagen sind Schätzungen aus deinen erfassten Daten, keine medizinische Beratung und keine Verhütung. Die Genauigkeit steigt, je mehr Zyklen du erfasst."

messages/en.json

@@ -4903,7 +4903,8 @@
     "symptomCategory": {
       "physical": "Physical",
       "emotional": "Emotional",
-      "digestive": "Digestive"
+      "digestive": "Digestive",
+      "custom": "Custom"
     },
     "symptom": {
       "cramps": "Cramps",
@@ -4920,7 +4921,16 @@
       "foodCravings": "Food cravings",
       "nausea": "Nausea",
       "diarrhea": "Diarrhea",
-      "constipation": "Constipation"
+      "constipation": "Constipation",
+      "custom": {
+        "add": "Add symptom",
+        "label": "Name",
+        "labelPlaceholder": "e.g. Dizziness",
+        "icon": "Icon",
+        "limitReached": "Custom symptom limit reached.",
+        "remove": "Remove {label}",
+        "fallbackLabel": "Custom symptom"
+      }
     },
     "prediction": {
       "disclaimer": "Predictions are estimates from your logged data, not medical advice or contraception. Accuracy improves as you log more cycles."

messages/es.json

@@ -4903,7 +4903,8 @@
     "symptomCategory": {
       "physical": "Físico",
       "emotional": "Emocional",
-      "digestive": "Digestivo"
+      "digestive": "Digestivo",
+      "custom": "Personalizado"
     },
     "symptom": {
       "cramps": "Calambres",
@@ -4920,7 +4921,16 @@
       "foodCravings": "Antojos",
       "nausea": "Náuseas",
       "diarrhea": "Diarrea",
-      "constipation": "Estreñimiento"
+      "constipation": "Estreñimiento",
+      "custom": {
+        "add": "Añadir síntoma",
+        "label": "Nombre",
+        "labelPlaceholder": "p. ej. Mareo",
+        "icon": "Icono",
+        "limitReached": "Se alcanzó el límite de síntomas personalizados.",
+        "remove": "Eliminar {label}",
+        "fallbackLabel": "Síntoma personalizado"
+      }
     },
     "prediction": {
       "disclaimer": "Las predicciones son estimaciones basadas en tus datos registrados, no son consejo médico ni un método anticonceptivo. La precisión mejora a medida que registras más ciclos."

messages/fr.json

@@ -4903,7 +4903,8 @@
     "symptomCategory": {
       "physical": "Physique",
       "emotional": "Émotionnel",
-      "digestive": "Digestif"
+      "digestive": "Digestif",
+      "custom": "Personnalisé"
     },
     "symptom": {
       "cramps": "Crampes",
@@ -4920,7 +4921,16 @@
       "foodCravings": "Fringales",
       "nausea": "Nausées",
       "diarrhea": "Diarrhée",
-      "constipation": "Constipation"
+      "constipation": "Constipation",
+      "custom": {
+        "add": "Ajouter un symptôme",
+        "label": "Nom",
+        "labelPlaceholder": "ex. Vertige",
+        "icon": "Icône",
+        "limitReached": "Limite de symptômes personnalisés atteinte.",
+        "remove": "Supprimer {label}",
+        "fallbackLabel": "Symptôme personnalisé"
+      }
     },
     "prediction": {
       "disclaimer": "Les prévisions sont des estimations issues de tes données enregistrées, et non un avis médical ou un moyen de contraception. La précision s'améliore à mesure que tu enregistres des cycles."

messages/it.json

@@ -4903,7 +4903,8 @@
     "symptomCategory": {
       "physical": "Fisico",
       "emotional": "Emotivo",
-      "digestive": "Digestivo"
+      "digestive": "Digestivo",
+      "custom": "Personalizzato"
     },
     "symptom": {
       "cramps": "Crampi",
@@ -4920,7 +4921,16 @@
       "foodCravings": "Voglie alimentari",
       "nausea": "Nausea",
       "diarrhea": "Diarrea",
-      "constipation": "Stitichezza"
+      "constipation": "Stitichezza",
+      "custom": {
+        "add": "Aggiungi sintomo",
+        "label": "Nome",
+        "labelPlaceholder": "es. Vertigini",
+        "icon": "Icona",
+        "limitReached": "Limite di sintomi personalizzati raggiunto.",
+        "remove": "Rimuovi {label}",
+        "fallbackLabel": "Sintomo personalizzato"
+      }
     },
     "prediction": {
       "disclaimer": "Le previsioni sono stime basate sui dati registrati, non sono un consiglio medico né un metodo contraccettivo. La precisione migliora man mano che registri più cicli."

messages/pl.json

@@ -4903,7 +4903,8 @@
     "symptomCategory": {
       "physical": "Fizyczne",
       "emotional": "Emocjonalne",
-      "digestive": "Trawienne"
+      "digestive": "Trawienne",
+      "custom": "Własne"
     },
     "symptom": {
       "cramps": "Skurcze",
@@ -4920,7 +4921,16 @@
       "foodCravings": "Zachcianki",
       "nausea": "Nudności",
       "diarrhea": "Biegunka",
-      "constipation": "Zaparcia"
+      "constipation": "Zaparcia",
+      "custom": {
+        "add": "Dodaj objaw",
+        "label": "Nazwa",
+        "labelPlaceholder": "np. Zawroty głowy",
+        "icon": "Ikona",
+        "limitReached": "Osiągnięto limit własnych objawów.",
+        "remove": "Usuń {label}",
+        "fallbackLabel": "Objaw własny"
+      }
     },
     "prediction": {
       "disclaimer": "Prognozy to szacunki na podstawie zapisanych danych, a nie porada medyczna ani metoda antykoncepcji. Dokładność rośnie wraz z liczbą zapisanych cykli."