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/en.json

@@ -444,5 +444,50 @@
       "PAYMENT_RECEIVED": "Payment received",
       "PAYMENT_FAILED": "Payment failed"
     }
+  },
+  "grow": {
+    "title": "Grow Calendar",
+    "newGrow": "Start New Grow",
+    "name": "Grow Name",
+    "strain": "Strain",
+    "stage": "Stage",
+    "startedAt": "Started",
+    "expectedHarvest": "Expected Harvest",
+    "daysInStage": "Days in stage",
+    "stages": {
+      "SEEDLING": "Seedling",
+      "VEGETATIVE": "Vegetative",
+      "FLOWERING": "Flowering",
+      "HARVEST": "Harvest",
+      "DRYING": "Drying",
+      "CURING": "Curing",
+      "COMPLETE": "Complete"
+    },
+    "advanceStage": "Next Stage",
+    "completeHarvest": "Complete Harvest",
+    "harvestGrams": "Harvest (g)",
+    "linkBatch": "Link to Batch",
+    "sensors": "Sensor Data",
+    "addReading": "Add Reading",
+    "temperature": "Temperature",
+    "humidity": "Humidity",
+    "co2": "CO₂",
+    "ph": "pH",
+    "ec": "EC",
+    "photos": "Photos",
+    "addPhoto": "Add Photo",
+    "caption": "Caption",
+    "feeding": "Feeding",
+    "addFeeding": "Add Feeding",
+    "nutrient": "Nutrient",
+    "amountMl": "Amount (ml)",
+    "waterLiters": "Water (L)",
+    "phAfter": "pH after",
+    "ecAfter": "EC after",
+    "timeline": "Timeline",
+    "noGrows": "No grow entries yet.",
+    "created": "Grow started.",
+    "stageAdvanced": "Stage advanced to {stage}.",
+    "harvestComplete": "Harvest completed — {grams}g linked to batch."
   }
-}
+}