feat: Add demo Room records for Dashboard display

Adds 6 cultivation zones to seed.ts:
- Flower Room A/B (78°F, 55% RH)
- Veg Room 1/2 (76°F, 65% RH)
- Drying Room (62°F, 60% RH)
- Cure Vault (65°F, 58% RH)

These rooms are now returned by /api/rooms for Dashboard display.

backend/prisma/seed.ts

@@ -78,6 +78,24 @@ async function main() {
         console.log('Updated Owner password hash');
     }
 
+    // Create Demo Rooms for Dashboard
+    const demoRooms = [
+        { name: 'Flower Room A', type: RoomType.FLOWER, sqft: 500, targetTemp: 78, targetHumidity: 55, capacity: 100 },
+        { name: 'Flower Room B', type: RoomType.FLOWER, sqft: 500, targetTemp: 78, targetHumidity: 55, capacity: 100 },
+        { name: 'Veg Room 1', type: RoomType.VEG, sqft: 300, targetTemp: 76, targetHumidity: 65, capacity: 200 },
+        { name: 'Veg Room 2', type: RoomType.VEG, sqft: 300, targetTemp: 76, targetHumidity: 65, capacity: 200 },
+        { name: 'Drying Room', type: RoomType.DRY, sqft: 150, targetTemp: 62, targetHumidity: 60, capacity: 50 },
+        { name: 'Cure Vault', type: RoomType.CURE, sqft: 200, targetTemp: 65, targetHumidity: 58, capacity: 100 }
+    ];
+
+    for (const r of demoRooms) {
+        const existingRoom = await prisma.room.findFirst({ where: { name: r.name } });
+        if (!existingRoom) {
+            await prisma.room.create({ data: r });
+            console.log(`Created Room: ${r.name}`);
+        }
+    }
+
     // Create Default Supplies
     const supplies = [
         {