refactor: standardize logging on zap across all packages

Replace all fmt.Printf/Println and log.Printf/Fatal with structured
zap.Logger calls to eliminate inconsistent logging (anti-pattern #12).

- network/crypt_conn: inject logger via NewCryptConn, replace 6 fmt calls
- signserver/session: use existing s.logger for debug packet dumps
- entranceserver: use s.logger for inbound/outbound debug logging
- api/utils: accept logger param in verifyPath, replace fmt.Println
- api/endpoints: use s.logger for screenshot path diagnostics
- config: replace log.Fatal with error return in getOutboundIP4
- deltacomp: replace log.Printf with zap.L() global logger

server/api/test_helpers.go

@@ -35,13 +35,12 @@ func NewTestConfig() *_config.Config {
 			MaxLauncherHR: false,
 		},
 		GameplayOptions: _config.GameplayOptions{
-			MezFesSoloTickets:     100,
-			MezFesGroupTickets:    50,
-			MezFesDuration:        604800, // 1 week
-			MezFesSwitchMinigame:  false,
+			MezFesSoloTickets:    100,
+			MezFesGroupTickets:   50,
+			MezFesDuration:       604800, // 1 week
+			MezFesSwitchMinigame: false,
 		},
-		LoginNotices:   []string{"Welcome to Erupe!"},
+		LoginNotices:    []string{"Welcome to Erupe!"},
 		HideLoginNotice: false,
 	}
 }
-