feat: complete Nextcloud Deck integration with English emoji stack names

- Renamed all stacks to English with emojis (Backlog, Planning, In Progress, Complete)
- Updated sync script to use new stack names
- Created all 3 initiative cards (IDs 189-191)
- Enhanced error handling with detailed debug output
- Updated documentation with API limitations and troubleshooting
- Fixed stack fallback from 'eingang' to '📥 Backlog'

Changes:
- scripts/sync-roadmap-to-deck.py: Updated STATUS_TO_STACK mapping, added verbose logging
- docs/NEXTCLOUD_DECK_SYNC.md: Updated stack table, added Known Limitations section, enhanced troubleshooting

Note: 6 duplicate/test cards (184-188, 192) must be deleted manually from Nextcloud UI
      due to API limitations (DELETE returns 405)

scripts/sync-roadmap-to-deck.py

@@ -32,14 +32,14 @@ STACKS = {stack['name']: stack['id'] for stack in DECK_CONFIG['stacks']}
 
 # Status to stack mapping
 STATUS_TO_STACK = {
-    'IN PROGRESS': 'in arbeit',
-    '🔄 IN PROGRESS': 'in arbeit',
-    'COMPLETE': 'erledigt',
-    '✅ COMPLETE': 'erledigt',
-    'PENDING': 'in planung',
-    '🔜 NEXT': 'in planung',
-    'FUTURE': 'eingang',
-    '🎯 FUTURE': 'eingang',
+    'IN PROGRESS': '🚀 In Progress',
+    '🔄 IN PROGRESS': '🚀 In Progress',
+    'COMPLETE': '✅ Complete',
+    '✅ COMPLETE': '✅ Complete',
+    'PENDING': '📋 Planning',
+    '🔜 NEXT': '📋 Planning',
+    'FUTURE': '📥 Backlog',
+    '🎯 FUTURE': '📥 Backlog',
 }
 
 # Roadmap files to parse
@@ -133,8 +133,8 @@ class RoadmapParser:
         content = filepath.read_text()
         tasks = []
         
-        # Parse initiatives (main sections)
-        initiative_pattern = r'## 🎯 Initiative (\d+): (.+?)(?=\n##|\Z)'
+        # Parse initiatives (main sections) - handle different emoji prefixes
+        initiative_pattern = r'## (?:🎯|📐|📊) Initiative (\d+): (.+?)(?=\n##|\Z)'
         initiatives = re.finditer(initiative_pattern, content, re.DOTALL)
         
         for initiative in initiatives:
@@ -247,25 +247,39 @@ def sync_roadmap_to_deck(dry_run: bool = False):
         title = task['title']
         
         # Create new card
-        stack_name = STATUS_TO_STACK.get(task['status'], 'eingang')
-        stack_id = STACKS[stack_name]
+        stack_name = STATUS_TO_STACK.get(task['status'], '📥 Backlog')
         
+        # Debug output
         print(f"✨ Create: {title}")
-        print(f"   Stack: {stack_name}")
+        print(f"   Status from roadmap: {task['status']!r}")
+        print(f"   Mapped to stack: {stack_name!r}")
+        
+        if stack_name not in STACKS:
+            print(f"   ❌ ERROR: Stack {stack_name!r} not found in STACKS")
+            print(f"   Available stacks: {list(STACKS.keys())}")
+            skipped += 1
+            continue
+            
+        stack_id = STACKS[stack_name]
+        print(f"   Stack ID: {stack_id}")
+        
         if task['progress']:
             print(f"   Progress: {task['progress']}")
         
         if not dry_run:
             try:
-                api.create_card(
+                result = api.create_card(
                     stack_id=stack_id,
                     title=title,
                     description=task['description'],
                     due_date=task['due_date'],
                 )
+                print(f"   ✅ Created card ID: {result['id']}")
                 created += 1
             except Exception as e:
                 print(f"   ❌ Error: {e}")
+                import traceback
+                traceback.print_exc()
                 skipped += 1
         else:
             created += 1