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>

api/types.go

@@ -232,37 +232,3 @@ func NewLogRecord(ch TLSClientHello, fp *Fingerprints) LogRecord {
 
 	return rec
 }
-
-// Default values and constants
-
-const (
-	DefaultInterface     = "eth0"
-	DefaultPort          = 443
-	DefaultBPFFilter     = ""
-	DefaultFlowTimeout   = 30 // seconds
-	DefaultPacketBuffer  = 1000 // packet channel buffer size
-
-	// Logging levels
-	LogLevelDebug = "DEBUG"
-	LogLevelInfo  = "INFO"
-	LogLevelWarn  = "WARN"
-	LogLevelError = "ERROR"
-)
-
-// DefaultConfig returns an AppConfig with sensible default values.
-// Uses eth0 as the default interface, port 443 for monitoring,
-// no BPF filter, a 30-second flow timeout, and a 1000-packet
-// channel buffer. Returns an empty outputs slice (caller must
-// configure outputs explicitly).
-func DefaultConfig() AppConfig {
-	return AppConfig{
-		Core: Config{
-			Interface:        DefaultInterface,
-			ListenPorts:      []uint16{DefaultPort},
-			BPFFilter:        DefaultBPFFilter,
-			FlowTimeoutSec:   DefaultFlowTimeout,
-			PacketBufferSize: DefaultPacketBuffer,
-		},
-		Outputs: []OutputConfig{},
-	}
-}