Add support for multiple droppers: discover and cache available dropper peripherals for location-based dispensing

inventoryManager.lua

@@ -645,6 +645,7 @@ local cache = {
     barrelOk   = false,
     furnaceCount  = 0,
     furnaceStatus = {},   -- per-furnace { name, type, input, fuel, output, active }
+    droppers      = {},   -- list of available dropper peripherals for dispensing
 }
 
 -------------------------------------------------
@@ -895,6 +896,21 @@ local function refreshCache(onProgress)
     cache.dropperOk  = peripheral.wrap(DROPPER_NAME) ~= nil
     cache.barrelOk   = peripheral.wrap(BARREL_NAME) ~= nil
 
+    -- Discover all droppers on the network (for location-based dispensing)
+    local droppers = {}
+    for _, name in ipairs(peripheral.getNames()) do
+        if peripheral.getType(name) == "minecraft:dropper" and name ~= COMPOST_DROPPER then
+            local isDefault = (name == DROPPER_NAME)
+            table.insert(droppers, { name = name, isDefault = isDefault })
+        end
+    end
+    -- Sort so default dropper comes first
+    table.sort(droppers, function(a, b)
+        if a.isDefault ~= b.isDefault then return a.isDefault end
+        return a.name < b.name
+    end)
+    cache.droppers = droppers
+
     -- Furnace count already computed from single-pass above
     cache.furnaceCount = #furnaces
 
@@ -2937,6 +2953,7 @@ local function broadcastState()
             barrelOk      = cache.barrelOk,
             furnaceCount  = cache.furnaceCount,
             furnaceStatus = cache.furnaceStatus,
+            droppers      = cache.droppers,
         },
         activity        = activity,
         alerts          = activeAlerts,