feat(sprint-6): Phase 5 — Full grow calendar (sensors, photos, feeding, harvest traceability)

- V9 migration: grow_entries, grow_stage_logs, sensor_readings, grow_photos, feeding_logs
- 5 entities + GrowStage enum (7 stages) + SensorReadingType enum
- GrowCalendarService: CRUD + stage advancement + harvest-to-batch linking
- GrowCalendarController: 8 endpoints (/api/v1/grow/*)
- Frontend: /grow list + /grow/[id] detail (timeline, sensor charts, photo gallery, feeding log)
- Sensor chart (Recharts line: temp + humidity over time)
- Harvest completion links grow entry → batch (full traceability)
- React Query hooks for all grow operations
- Full i18n (de/en) with 7 grow stage labels
- Sidebar navigation updated with Anbau/Grow entry

cannamanage-frontend/messages/de.json

@@ -444,5 +444,50 @@
       "PAYMENT_RECEIVED": "Zahlung erhalten",
       "PAYMENT_FAILED": "Zahlung fehlgeschlagen"
     }
+  },
+  "grow": {
+    "title": "Anbau-Kalender",
+    "newGrow": "Neuen Anbau starten",
+    "name": "Anbau-Name",
+    "strain": "Sorte",
+    "stage": "Phase",
+    "startedAt": "Gestartet am",
+    "expectedHarvest": "Erwartete Ernte",
+    "daysInStage": "Tage in Phase",
+    "stages": {
+      "SEEDLING": "Sämling",
+      "VEGETATIVE": "Vegetativ",
+      "FLOWERING": "Blüte",
+      "HARVEST": "Ernte",
+      "DRYING": "Trocknung",
+      "CURING": "Fermentierung",
+      "COMPLETE": "Abgeschlossen"
+    },
+    "advanceStage": "Nächste Phase",
+    "completeHarvest": "Ernte abschließen",
+    "harvestGrams": "Erntemenge (g)",
+    "linkBatch": "Mit Charge verknüpfen",
+    "sensors": "Sensordaten",
+    "addReading": "Messwert hinzufügen",
+    "temperature": "Temperatur",
+    "humidity": "Luftfeuchtigkeit",
+    "co2": "CO₂",
+    "ph": "pH-Wert",
+    "ec": "EC-Wert",
+    "photos": "Fotos",
+    "addPhoto": "Foto hinzufügen",
+    "caption": "Beschriftung",
+    "feeding": "Düngung",
+    "addFeeding": "Düngung hinzufügen",
+    "nutrient": "Nährstoff",
+    "amountMl": "Menge (ml)",
+    "waterLiters": "Wasser (L)",
+    "phAfter": "pH danach",
+    "ecAfter": "EC danach",
+    "timeline": "Verlauf",
+    "noGrows": "Noch keine Anbau-Einträge.",
+    "created": "Anbau gestartet.",
+    "stageAdvanced": "Phase gewechselt zu {stage}.",
+    "harvestComplete": "Ernte abgeschlossen — {grams}g verknüpft mit Charge."
   }
-}
+}