chore: remove unused files and code

- Delete obsolete RPM maintainer scripts (postinst, prerm, postrm)
  Scripts are now embedded in ja4sentinel.spec
- Delete unused RPM test script (test-rpm.sh)
  Referenced non-existent el7 builds, not integrated in CI
- Remove unused constants and functions from api/types.go:
  - DefaultInterface, DefaultPort, DefaultBPFFilter
  - DefaultFlowTimeout, DefaultPacketBuffer
  - LogLevelDebug, LogLevelInfo, LogLevelWarn, LogLevelError
  - DefaultConfig() function
- Update Makefile with RPM_DIR variable for consistency

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

packaging/rpm/postinst

@@ -1,45 +0,0 @@
-#!/bin/bash
-#
-# postinst - Script d'installation post-RPM pour ja4sentinel
-# Compatible CentOS 7, Rocky Linux 8/9/10
-#
-
-set -e
-
-echo "==> ja4sentinel: Running post-installation script..."
-
-# Set proper ownership
-chown -R ja4sentinel:ja4sentinel /var/lib/ja4sentinel 2>/dev/null || true
-chown -R ja4sentinel:ja4sentinel /var/run/ja4sentinel 2>/dev/null || true
-chown -R ja4sentinel:ja4sentinel /var/log/ja4sentinel 2>/dev/null || true
-chown -R ja4sentinel:ja4sentinel /etc/ja4sentinel 2>/dev/null || true
-
-# Set proper permissions
-chmod 750 /var/lib/ja4sentinel 2>/dev/null || true
-chmod 750 /var/log/ja4sentinel 2>/dev/null || true
-chmod 750 /etc/ja4sentinel 2>/dev/null || true
-
-# Install config if not exists
-if [ ! -f /etc/ja4sentinel/config.yml ]; then
-    echo "==> ja4sentinel: Installing default configuration..."
-    cp /usr/share/ja4sentinel/config.yml /etc/ja4sentinel/config.yml
-    chown ja4sentinel:ja4sentinel /etc/ja4sentinel/config.yml 2>/dev/null || true
-    chmod 640 /etc/ja4sentinel/config.yml
-fi
-
-# Reload systemd and enable service (only if systemd is running)
-if [ -x /bin/systemctl ] && [ -d /run/systemd/system ]; then
-    echo "==> ja4sentinel: Reloading systemd daemon..."
-    /bin/systemctl daemon-reload
-    
-    echo "==> ja4sentinel: Enabling ja4sentinel.service..."
-    /bin/systemctl enable ja4sentinel.service 2>/dev/null || :
-    
-    echo "==> ja4sentinel: Starting ja4sentinel.service..."
-    /bin/systemctl start ja4sentinel.service 2>/dev/null || :
-else
-    echo "==> ja4sentinel: systemd not detected (container environment), skipping service management..."
-fi
-
-echo "==> ja4sentinel: Post-installation complete."
-exit 0

packaging/rpm/postrm

@@ -1,18 +0,0 @@
-#!/bin/bash
-#
-# postrm - Script de post-désinstallation RPM pour ja4sentinel
-# Compatible CentOS 7, Rocky Linux 8/9/10
-#
-
-set -e
-
-echo "==> ja4sentinel: Running post-removal script..."
-
-# Reload systemd after removal
-if [ -x /bin/systemctl ]; then
-    echo "==> ja4sentinel: Reloading systemd daemon..."
-    /bin/systemctl daemon-reload
-fi
-
-echo "==> ja4sentinel: Post-removal complete."
-exit 0

packaging/rpm/prerm

@@ -1,21 +0,0 @@
-#!/bin/bash
-#
-# prerm - Script de pré-désinstallation RPM pour ja4sentinel
-# Compatible CentOS 7, Rocky Linux 8/9/10
-#
-
-set -e
-
-echo "==> ja4sentinel: Running pre-removal script..."
-
-# Stop and disable service before removal
-if [ -x /bin/systemctl ]; then
-    echo "==> ja4sentinel: Stopping ja4sentinel.service..."
-    /bin/systemctl stop ja4sentinel.service >/dev/null 2>&1 || :
-    
-    echo "==> ja4sentinel: Disabling ja4sentinel.service..."
-    /bin/systemctl disable ja4sentinel.service >/dev/null 2>&1 || :
-fi
-
-echo "==> ja4sentinel: Pre-removal complete."
-exit 0