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/analytics/Analytics.kt

@@ -36,6 +36,20 @@ object AnalyticsEvents {
     const val NEW_TASK_SCREEN_SHOWN = "new_task_screen_shown"
     const val TASK_CREATED = "task_created"
 
+    // Onboarding — First Task screen funnel
+    // Fired by both iOS and Android with identical event names so the
+    // PostHog funnel is cross-platform. Properties documented next to each.
+    //   ONBOARDING_SUGGESTIONS_LOADED: {"count": Int, "profile_completeness": Double}
+    //   ONBOARDING_SUGGESTION_ACCEPTED: {"template_id": Int, "relevance_score": Double}
+    //   ONBOARDING_BROWSE_TEMPLATE_ACCEPTED: {"template_id": Int, "category": String?}
+    //   ONBOARDING_TASKS_CREATED: {"count": Int}
+    //   ONBOARDING_TASK_STEP_SKIPPED: {"reason": "network_error" | "user_skip"}
+    const val ONBOARDING_SUGGESTIONS_LOADED = "onboarding_suggestions_loaded"
+    const val ONBOARDING_SUGGESTION_ACCEPTED = "onboarding_suggestion_accepted"
+    const val ONBOARDING_BROWSE_TEMPLATE_ACCEPTED = "onboarding_browse_template_accepted"
+    const val ONBOARDING_TASKS_CREATED = "onboarding_tasks_created"
+    const val ONBOARDING_TASK_STEP_SKIPPED = "onboarding_task_step_skipped"
+
     // Contractor
     const val CONTRACTOR_SCREEN_SHOWN = "contractor_screen_shown"
     const val NEW_CONTRACTOR_SCREEN_SHOWN = "new_contractor_screen_shown"