Fix caption cache timing, commit path tracking, and clean up start script

- Move caption cache refresh before UI render so indicators show on load
- Return actual dest paths from commit_batch/commit_global to fix
  caption-on-apply silently failing when files are renamed on collision
- Simplify start.sh to only run NiceGUI (remove Streamlit)
- Add requests to requirements.txt

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

start.sh

@@ -1,18 +1,25 @@
 #!/bin/bash
 
-# 1. Navigate to app directory
-cd /app
+# NiceSorter - Start Script
+# Runs the NiceGUI gallery interface on port 8080
 
-# 2. Install dependencies (Including NiceGUI if missing)
-# This checks your requirements.txt AND ensures nicegui is present
-pip install --no-cache-dir -r requirements.txt
+set -e
 
-# 3. Start NiceGUI in the Background (&)
-# This runs silently while the script continues
-echo "🚀 Starting NiceGUI on Port 8080..."
-python3 gallery_app.py &
+# Navigate to app directory if running in container
+if [ -d "/app" ]; then
+    cd /app
+fi
 
-# 4. Start Streamlit in the Foreground
-# This keeps the container running
-echo "🚀 Starting Streamlit on Port 8501..."
-streamlit run app.py --server.port=8501 --server.address=0.0.0.0
+# Install dependencies if requirements.txt exists
+if [ -f "requirements.txt" ]; then
+    echo "📦 Installing dependencies..."
+    pip install --no-cache-dir -q -r requirements.txt
+fi
+
+# Initialize database
+echo "🗄️ Initializing database..."
+python3 -c "from engine import SorterEngine; SorterEngine.init_db()"
+
+# Start NiceGUI
+echo "🚀 Starting NiceSorter on http://0.0.0.0:8080"
+exec python3 gallery_app.py