Add honeycomb completion heatmap and dev API environment

- Add HoneycombSummaryView component with colored hexagon grid
- Display completion summary on residence detail screen
- Add CompletionSummary model to KMP shared layer
- Add DEV/PROD environment split in ApiConfig
- Fix ResidenceResponse initializers for completionSummary parameter

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

composeApp/src/commonMain/kotlin/com/tt/honeyDue/models/Residence.kt

@@ -52,6 +52,7 @@ data class ResidenceResponse(
     @SerialName("is_primary") val isPrimary: Boolean = false,
     @SerialName("is_active") val isActive: Boolean = true,
     @SerialName("overdue_count") val overdueCount: Int = 0,
+    @SerialName("completion_summary") val completionSummary: CompletionSummary? = null,
     @SerialName("created_at") val createdAt: String,
     @SerialName("updated_at") val updatedAt: String
 ) {
@@ -261,6 +262,38 @@ data class RemoveUserResponse(
     val message: String
 )
 
+/**
+ * Completion summary for honeycomb grid display.
+ * Returned by the residence detail endpoint.
+ */
+@Serializable
+data class CompletionSummary(
+    @SerialName("total_all_time") val totalAllTime: Int = 0,
+    @SerialName("total_last_12_months") val totalLast12Months: Int = 0,
+    val months: List<MonthlyCompletionSummary> = emptyList()
+)
+
+/**
+ * Monthly completion breakdown by kanban column.
+ */
+@Serializable
+data class MonthlyCompletionSummary(
+    val month: String, // "2025-04" format
+    val completions: List<ColumnCompletionCount> = emptyList(),
+    val total: Int = 0,
+    val overflow: Int = 0
+)
+
+/**
+ * Count of completions from a specific kanban column with its color.
+ */
+@Serializable
+data class ColumnCompletionCount(
+    val column: String,
+    val color: String,
+    val count: Int
+)
+
 // Type aliases for backwards compatibility with existing code
 typealias Residence = ResidenceResponse
 typealias ResidenceShareCode = ShareCodeResponse