feat(editor): WPRT JSON round-trip closure

Adds --export-wprt-json / --import-wprt-json with the established
readEnumField template factoring int+name dual encoding for both
factionAccess ("both"/"alliance"/"horde"/"neutral") and portalKind
("teleport"/"portal"). Float fields (destX/Y/Z, destOrientation)
preserved bit-for-bit through JSON.

All 3 presets (alliance/horde/teleports) byte-identical binary
roundtrip OK including the Teleport: Orgrimmar Horde-faction
entry that crosses the otherwise-Alliance teleports preset.

Live-tested reagent-mismatch warning: hand-mutated Stormwind
Portal entry (Portal kind) to use Rune of Teleportation (17031
— Teleport reagent), validator correctly emitted: "Portal kind
with reagentItemId=17031 — vanilla group portals require Rune
of Portals (itemId 17032). Verify intentional".

CLI flag count 1362 -> 1364.

tools/editor/cli_arg_required.cpp

@@ -397,6 +397,7 @@ const char* const kArgRequired[] = {
     "--export-wtsc-json", "--import-wtsc-json",
     "--gen-prt-alliance", "--gen-prt-horde", "--gen-prt-teleports",
     "--info-wprt", "--validate-wprt",
+    "--export-wprt-json", "--import-wprt-json",
     "--gen-weather-temperate", "--gen-weather-arctic",
     "--gen-weather-desert", "--gen-weather-stormy",
     "--gen-zone-atmosphere",