feat: use postcard for redis serde (#6956)

* redo error handling in xredis

* give proper types to metadata fields

* add round-trip tests

* inline loader enum metadata fields

* postcard roundtrips

* prepare

* bump redis key version

* serde-binhum

* clippy

* fix

* fix frontend checking existence of component fields rather than non-null-ness

* prepare

apps/frontend/src/pages/[type]/[project].vue

@@ -2014,9 +2014,7 @@ const navLinks = computed(() => {
 			label: formatMessage(messages.changelogTab),
 			href: withInstallContextQuery(`${projectUrl}/changelog`),
 			shown:
-				hasVersions.value &&
-				projectV3Loaded.value &&
-				projectV3.value?.minecraft_server === undefined,
+				hasVersions.value && projectV3Loaded.value && projectV3.value?.minecraft_server == null,
 			onHover: loadVersions,
 		},
 		{
@@ -2025,7 +2023,7 @@ const navLinks = computed(() => {
 			shown:
 				(hasVersions.value || !!currentMember.value) &&
 				projectV3Loaded.value &&
-				projectV3.value?.minecraft_server === undefined,
+				projectV3.value?.minecraft_server == null,
 			subpages: [`${projectUrl}/version/`],
 			onHover: loadVersions,
 		},