feat(F.14): Unified Task System — F-TASK-MODEL/API/AGENT/WORK/UI/MIG/GOAL/TEST

- F-TASK-MODEL: Extended Task model with polymorphic assignee/entity/creator, subtasks, dependencies, task_type, success_criteria, progress
- F-TASK-API: Extended task routes with polymorphic filters, subtasks, dependencies, new lifecycle
- F-TASK-AGENT: ai_tools.py (191 lines) — create_task, assign_task, update_task_status, decompose_goal tools
- F-TASK-WORK: workstream.py — task_card and goal_card blocks in communication system
- F-TASK-UI: TaskBoard.tsx, TaskDetail.tsx, GoalView.tsx frontend components
- F-TASK-MIG: Migration 0124 — new columns, data migration for contact_id/assigned_to
- F-TASK-GOAL: Progress aggregation, success criteria evaluation, parent status propagation
- F-TASK-TEST: test_unified_tasks.py (414 lines)
- i18n updates for task system

frontend/src/i18n/locales/de.json

@@ -1083,11 +1083,39 @@
     "priority_field": "Priorität",
     "statusOpen": "Offen",
     "statusInProgress": "In Bearbeitung",
+    "statusReview": "Review",
+    "statusBlocked": "Blockiert",
     "statusDone": "Erledigt",
+    "statusCancelled": "Abgebrochen",
     "priorityLow": "Niedrig",
     "priorityMedium": "Mittel",
     "priorityHigh": "Hoch",
-    "priorityUrgent": "Dringend"
+    "priorityUrgent": "Dringend",
+    "typeTodo": "Aufgabe",
+    "typeApproval": "Freigabe",
+    "typeFollowUp": "Follow-up",
+    "typeReview": "Review",
+    "typeGoal": "Ziel",
+    "typeMilestone": "Meilenstein",
+    "typeAgentSubtask": "Agent-Subtask",
+    "assigneeType": "Zuweisungstyp",
+    "assigneeId": "Zuweisungs-ID",
+    "assigneeTypeUser": "Benutzer",
+    "assigneeTypeAgent": "Agent",
+    "assigneeTypeGroup": "Gruppe",
+    "assign": "Zuweisen",
+    "subtasks": "Unteraufgaben",
+    "noSubtasks": "Keine Unteraufgaben",
+    "subtaskPlaceholder": "Unteraufgaben-Titel...",
+    "addSubtask": "Unteraufgabe hinzufügen",
+    "dependencies": "Abhängigkeiten",
+    "noDependencies": "Keine Abhängigkeiten",
+    "dependencyPlaceholder": "Task-ID...",
+    "addDependency": "Abhängigkeit hinzufügen",
+    "removeDependency": "Abhängigkeit entfernen",
+    "targetDate": "Zieldatum",
+    "progress": "Fortschritt",
+    "milestones": "Meilensteine"
   },
   "savedFilters": {
     "save": "Filter speichern",