Wire onboarding task suggestions to backend, delete hardcoded catalog

Both "For You" and "Browse All" tabs are now fully server-driven on
iOS and Android. No on-device task list, no client-side scoring rules.
When the API fails the screen shows error + Retry + Skip so onboarding
can still complete on a flaky network.

Shared (KMM)
- TaskCreateRequest + TaskResponse carry templateId
- New BulkCreateTasksRequest/Response, TaskApi.bulkCreateTasks,
  APILayer.bulkCreateTasks (updates DataManager + TotalSummary)
- OnboardingViewModel: templatesGroupedState + loadTemplatesGrouped;
  createTasks(residenceId, requests) posts once via the bulk path
- Deleted regional-template plumbing: APILayer.getRegionalTemplates,
  OnboardingViewModel.loadRegionalTemplates, TaskTemplateApi.
  getTemplatesByRegion, TaskTemplate.regionId/regionName
- 5 new AnalyticsEvents constants for the onboarding funnel

Android (Compose)
- OnboardingFirstTaskContent rewritten against the server catalog;
  ~70 lines of hardcoded taskCategories gone. Loading / Error / Empty
  panes with Retry + Skip buttons. Category icons derived from name
  keywords, colours from a 5-value palette keyed by category id
- Browse selection carries template.id into the bulk request so
  task_template_id is populated server-side

iOS (SwiftUI)
- New OnboardingTasksViewModel (@MainActor ObservableObject) wrapping
  APILayer.shared for suggestions / grouped / bulk-submit with
  loading + error state (mirrors the TaskViewModel.swift pattern)
- OnboardingFirstTaskView rewritten: buildForYouSuggestions (130 lines)
  and fallbackCategories (68 lines) deleted; both tabs show the same
  error+skip UX as Android; ForYouSuggestion/SuggestionRelevance gone
- 5 new AnalyticsEvent cases with identical PostHog event names to
  the Kotlin constants so cross-platform funnels join cleanly
- Existing TaskCreateRequest / TaskResponse call sites in TaskCard,
  TasksSection, TaskFormView updated for the new templateId parameter

Docs
- CLAUDE.md gains an "Onboarding task suggestions (server-driven)"
  subsection covering the data flow, key files on both platforms,
  and the KotlinInt(int: template.id) wrapping requirement

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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

@@ -53,6 +53,9 @@ data class TaskResponse(
     @SerialName("is_cancelled") val isCancelled: Boolean = false,
     @SerialName("is_archived") val isArchived: Boolean = false,
     @SerialName("parent_task_id") val parentTaskId: Int? = null,
+    // Backlink to the TaskTemplate this task was spawned from (onboarding
+    // suggestion or browse catalog). Null for user-created custom tasks.
+    @SerialName("template_id") val templateId: Int? = null,
     @SerialName("completion_count") val completionCount: Int = 0,
     @SerialName("kanban_column") val kanbanColumn: String? = null, // Which kanban column this task belongs to
     // Note: Go API does not return completions inline with TaskResponse.
@@ -133,7 +136,33 @@ data class TaskCreateRequest(
     @SerialName("assigned_to_id") val assignedToId: Int? = null,
     @SerialName("due_date") val dueDate: String? = null,
     @SerialName("estimated_cost") val estimatedCost: Double? = null,
-    @SerialName("contractor_id") val contractorId: Int? = null
+    @SerialName("contractor_id") val contractorId: Int? = null,
+    // Set when the task is spawned from a TaskTemplate (onboarding
+    // suggestion or browse catalog). Null for free-form custom tasks.
+    @SerialName("template_id") val templateId: Int? = null
+)
+
+/**
+ * Bulk create request matching Go API BulkCreateTasksRequest.
+ * Used by onboarding to insert 1-50 tasks atomically in a single
+ * transaction. The server forces every entry's residence_id to the
+ * top-level value, so any mismatch in the list is silently corrected.
+ */
+@Serializable
+data class BulkCreateTasksRequest(
+    @SerialName("residence_id") val residenceId: Int,
+    val tasks: List<TaskCreateRequest>
+)
+
+/**
+ * Bulk create response matching Go API BulkCreateTasksResponse.
+ * All [tasks] are created-or-none — partial state never reaches the client.
+ */
+@Serializable
+data class BulkCreateTasksResponse(
+    val tasks: List<TaskResponse>,
+    val summary: TotalSummary,
+    @SerialName("created_count") val createdCount: Int
 )
 
 /**

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

@@ -20,9 +20,7 @@ data class TaskTemplate(
     @SerialName("icon_android") val iconAndroid: String = "",
     val tags: List<String> = emptyList(),
     @SerialName("display_order") val displayOrder: Int = 0,
-    @SerialName("is_active") val isActive: Boolean = true,
-    @SerialName("region_id") val regionId: Int? = null,
-    @SerialName("region_name") val regionName: String? = null
+    @SerialName("is_active") val isActive: Boolean = true
 ) {
     /**
      * Human-readable frequency display