fix: 修复 apt 升级后服务需要手动重新启用的问题

- 修改 prerm 脚本，升级时只停止服务不禁用
- 修改 postinst 脚本，升级后自动重启已启用的服务
- 首次安装仍保持手动启用服务的行为

debian/postinst

@@ -13,13 +13,13 @@ if ! getent passwd p2pool >/dev/null; then
 fi
 
 # Create data directory
-mkdir -p /var/lib/p2pool
-chown p2pool:p2pool /var/lib/p2pool
-chmod 750 /var/lib/p2pool
+mkdir -p /var/lib/p2pool/data-api
+chown -R p2pool:p2pool /var/lib/p2pool
+chmod -R 750 /var/lib/p2pool
 
 # Create example params.conf if it doesn't exist
 if [ ! -f /var/lib/p2pool/params.conf ]; then
-    cat > /var/lib/p2pool/params.conf << 'EOF'
+    cat > /var/lib/p2pool/params.conf << 'CONF'
 # P2Pool Configuration File
 # Edit this file with your settings and restart the service
 
@@ -28,6 +28,12 @@ host = 127.0.0.1
 rpc-port = 18081
 zmq-port = 18083
 
+# Use SSL for RPC connection
+# rpc-ssl = true
+
+# RPC credentials (if applicable)
+# rpc-login = username:password
+
 # Your Monero wallet address (REQUIRED)
 wallet = YOUR_MONERO_WALLET_ADDRESS
 
@@ -46,11 +52,11 @@ loglevel = 3
 # mini = true
 
 # Merge mining (optional - uncomment to enable Tari merge mining)
-# merge-mine = tari://TARI_NODE_IP:18102 TARI_WALLET_ADDRESS
+# merge-mine = tari://TARI_NODE_IP:18142 TARI_WALLET_ADDRESS
 
 # Stratum server (for miners to connect)
 # stratum = 0.0.0.0:3333
-EOF
+CONF
     chown p2pool:p2pool /var/lib/p2pool/params.conf
     chmod 640 /var/lib/p2pool/params.conf
 fi
@@ -64,9 +70,22 @@ chmod 750 /var/log/p2pool
 chown root:root /opt/p2pool/p2pool
 chmod 755 /opt/p2pool/p2pool
 
-# Reload systemd
+# Reload systemd and handle service restart on upgrade
 if [ -d /run/systemd/system ]; then
     systemctl daemon-reload
+
+    # On upgrade: restart service if it was enabled
+    if [ "$1" = "configure" ] && [ -n "$2" ]; then
+        # $2 is the previously installed version (only set on upgrade)
+        if systemctl is-enabled --quiet p2pool.service 2>/dev/null; then
+            echo "Restarting p2pool service after upgrade..."
+            systemctl start p2pool.service || true
+        fi
+    fi
+    # Note: On fresh install, service is NOT auto-enabled or auto-started
+    # Users should manually enable the service:
+    #   systemctl enable p2pool.service
+    #   systemctl start p2pool.service
 fi
 
 echo ""