feat: add Nextcloud Deck roadmap sync system

- Create discover-deck-ids.sh to find board/stack configuration
- Implement sync-roadmap-to-deck.py for roadmap → Deck sync
- Parse OPTIMIZATION_MASTER_ROADMAP.md and extract initiatives
- Map roadmap status to Deck stacks (eingang/planung/arbeit/erledigt)
- Create cards with titles, descriptions, due dates, progress
- Support dry-run mode for testing before actual sync
- Add comprehensive documentation in NEXTCLOUD_DECK_SYNC.md

**Benefits:**
- Visual kanban board for roadmap management
- Drag & drop to prioritize tasks
- Single source of truth (markdown files)
- Easy task tracking and status updates
- No manual duplication between systems

**Initial Sync:**
- Created 1 card: Initiative 1 (Signal Quality Optimization)
- Placed in 'eingang' (FUTURE status)

**Future Work:**
- Bidirectional sync (Deck → Roadmap)
- Phase-level cards parsing
- Manual card creation → roadmap entry
- Automated cron sync

scripts/discover-deck-ids.sh

@@ -0,0 +1,70 @@
+#!/bin/bash
+# Discover Nextcloud Deck Board and Stack IDs
+# Usage: ./discover-deck-ids.sh
+
+set -e
+
+NEXTCLOUD_URL="${NEXTCLOUD_URL:-http://10.0.0.48:8089}"
+NEXTCLOUD_USER="${NEXTCLOUD_USER:-robert.wiegand}"
+NEXTCLOUD_PASSWORD="${NEXTCLOUD_PASSWORD:-November1985**}"
+
+echo "🔍 Discovering Nextcloud Deck configuration..."
+echo ""
+
+# Get all boards
+echo "📋 Available Boards:"
+BOARDS=$(curl -sS -X GET "${NEXTCLOUD_URL}/index.php/apps/deck/api/v1.0/boards" \
+  -u "${NEXTCLOUD_USER}:${NEXTCLOUD_PASSWORD}" \
+  -H 'OCS-APIRequest: true' \
+  -k)
+
+echo "$BOARDS" | jq -r '.[] | "  ID: \(.id) - Title: \(.title)"'
+echo ""
+
+# Find trader board
+TRADER_BOARD_ID=$(echo "$BOARDS" | jq -r '.[] | select(.title | test("trader"; "i")) | .id' | head -1)
+
+if [ -z "$TRADER_BOARD_ID" ]; then
+  echo "❌ No board with 'trader' in title found!"
+  echo "Please create a board called 'trader' in Nextcloud Deck first."
+  exit 1
+fi
+
+echo "✅ Found 'trader' board with ID: $TRADER_BOARD_ID"
+echo ""
+
+# Get stacks for trader board
+echo "📚 Stacks in 'trader' board:"
+STACKS=$(curl -sS -X GET "${NEXTCLOUD_URL}/index.php/apps/deck/api/v1.0/boards/${TRADER_BOARD_ID}/stacks" \
+  -u "${NEXTCLOUD_USER}:${NEXTCLOUD_PASSWORD}" \
+  -H 'OCS-APIRequest: true' \
+  -k)
+
+echo "$STACKS" | jq -r '.[] | "  ID: \(.id) - Title: \(.title) - Order: \(.order)"'
+echo ""
+
+# Create config snippet
+echo "📝 Configuration for sync-roadmap-to-deck.py:"
+echo ""
+echo "nextcloud:"
+echo "  url: \"${NEXTCLOUD_URL}\""
+echo "  user: \"${NEXTCLOUD_USER}\""
+echo "  board_id: ${TRADER_BOARD_ID}"
+echo "  stacks:"
+echo "$STACKS" | jq -r '.[] | "    \(.title | ascii_downcase | gsub(" "; "_")): \(.id)  # \(.title)"'
+echo ""
+
+# Save to temp file for script to use
+cat > /tmp/deck-config.json <<EOF
+{
+  "url": "${NEXTCLOUD_URL}",
+  "user": "${NEXTCLOUD_USER}",
+  "password": "${NEXTCLOUD_PASSWORD}",
+  "board_id": ${TRADER_BOARD_ID},
+  "stacks": $(echo "$STACKS" | jq '[.[] | {name: .title, id: .id, order: .order}]')
+}
+EOF
+
+echo "✅ Configuration saved to /tmp/deck-config.json"
+echo ""
+echo "Run: python3 scripts/sync-roadmap-to-deck.py --init"