feat: Add A-Z filter for clients/suppliers in Telegram bot

- Add A-Z alphabetical filter keyboard for clients and suppliers lists
  (same pattern as company selection, without emoji)
- Increase clients/suppliers list pagination from 10 to 20 items per page
- Remove emoji from company A-Z filter button for consistency
- Add 6 new callback handlers: clients_alpha_menu, clients_alpha:LETTER,
  clients_alpha_page:PAGE:LETTER, and supplier equivalents
- Dashboard service and models updates
- Telegram bot: email handlers, auth, DB operations, internal API improvements
- Frontend: dashboard cards updates (CashFlow, Clienti, Furnizori, Treasury)
- Frontend: SolduriCompactCard and CollapsibleCard improvements
- DashboardView enhancements
- start.sh and run-with-restart.sh script updates
- IIS web.config and service worker updates

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

backend/run-with-restart.sh

@@ -11,6 +11,18 @@ LOG_FILE=${2:-/tmp/unified_backend.log}
 MAX_RESTARTS=10
 RESTART_COUNT=0
 RESTART_DELAY=3
+UVICORN_PID=""
+
+# On SIGTERM or SIGINT: kill uvicorn child and exit cleanly (no restart)
+cleanup_and_exit() {
+    echo "[Backend Runner] Received termination signal, stopping..." | tee -a "$LOG_FILE"
+    if [ -n "$UVICORN_PID" ] && kill -0 "$UVICORN_PID" 2>/dev/null; then
+        kill "$UVICORN_PID" 2>/dev/null
+        wait "$UVICORN_PID" 2>/dev/null
+    fi
+    exit 0
+}
+trap cleanup_and_exit SIGTERM SIGINT
 
 echo "[Backend Runner] Starting uvicorn with auto-restart (max $MAX_RESTARTS restarts)" | tee -a "$LOG_FILE"
 echo "[Backend Runner] Port: $PORT, Log: $LOG_FILE" | tee -a "$LOG_FILE"
@@ -20,15 +32,27 @@ while [ $RESTART_COUNT -lt $MAX_RESTARTS ]; do
     echo "" | tee -a "$LOG_FILE"
     echo "[Backend Runner] $(date '+%Y-%m-%d %H:%M:%S') - Starting uvicorn (attempt $((RESTART_COUNT + 1))/$MAX_RESTARTS)..." | tee -a "$LOG_FILE"
 
-    # Run uvicorn - it will exit on crash (OOM, etc.)
-    uvicorn main:app --host 0.0.0.0 --port "$PORT" 2>&1 | tee -a "$LOG_FILE"
+    # Run uvicorn in background so we can track its PID and trap signals properly
+    uvicorn main:app --host 0.0.0.0 --port "$PORT" >> "$LOG_FILE" 2>&1 &
+    UVICORN_PID=$!
+
+    # Wait for uvicorn to exit
+    wait "$UVICORN_PID"
     EXIT_CODE=$?
+    UVICORN_PID=""
 
     END_TIME=$(date +%s)
     RUNTIME=$((END_TIME - START_TIME))
 
     echo "[Backend Runner] $(date '+%Y-%m-%d %H:%M:%S') - uvicorn exited with code $EXIT_CODE after ${RUNTIME}s" | tee -a "$LOG_FILE"
 
+    # Exit if trap already fired (cleanup_and_exit sets UVICORN_PID="")
+    # or if uvicorn exited due to a signal (130=SIGINT, 143=SIGTERM, 137=SIGKILL)
+    if [ $EXIT_CODE -eq 130 ] || [ $EXIT_CODE -eq 143 ] || [ $EXIT_CODE -eq 137 ]; then
+        echo "[Backend Runner] Received termination signal (code $EXIT_CODE), exiting..." | tee -a "$LOG_FILE"
+        exit 0
+    fi
+
     # If it ran for more than 60 seconds, reset restart counter (was stable)
     if [ $RUNTIME -gt 60 ]; then
         RESTART_COUNT=0
@@ -38,12 +62,6 @@ while [ $RESTART_COUNT -lt $MAX_RESTARTS ]; do
         echo "[Backend Runner] Quick crash detected, restart count: $RESTART_COUNT/$MAX_RESTARTS" | tee -a "$LOG_FILE"
     fi
 
-    # Exit if user sent SIGINT (Ctrl+C) or SIGTERM
-    if [ $EXIT_CODE -eq 130 ] || [ $EXIT_CODE -eq 143 ]; then
-        echo "[Backend Runner] Received termination signal, exiting..." | tee -a "$LOG_FILE"
-        exit 0
-    fi
-
     # Wait before restart
     if [ $RESTART_COUNT -lt $MAX_RESTARTS ]; then
         echo "[Backend Runner] Restarting in ${RESTART_DELAY}s..." | tee -a "$LOG_FILE"