feat(sdk): per-locale module tag labels (TagLabels), mirroring NameLabels

[I-am-nothing]

Problem

The module card (module-info-dialog header + the /modules grid tile) renders a module's TAGS ("Auth") in English regardless of locale. The manifest's defaults.Tags is a raw []string with no per-locale map at all — unlike defaults.NameLabels (per-locale display name, module.name catalog key) and descriptionLabels (added earlier this session), which the web already resolves by locale.

Change (SDK only)

Add ManifestDefaults.TagLabels map[string][]string (locale → localized tag LIST, JSON key tagLabels, omitempty) alongside the existing raw Tags — Tags stays the default/fallback, mirroring how Name stays the fallback for NameLabels.

Resolution mirrors NameLabels: read the module's i18n catalog at manifest build. New i18n.LookupList(key, sep) is the list counterpart of i18n.Lookup — like Lookup it does not fall back to the raw key, so a locale with no translation is omitted and the web falls back to raw Tags.

Authoring convention (wire shape for the web agent)

Message catalogs are string-valued (flatten() ignores JSON array leaves), so the author packs each locale's tag list into a single comma-separated catalog value under the key module.tags:

// i18n/en-US.json      // i18n/zh-TW.json
"module": {             "module": {
  "name": "OAuth Core",   "name": "使用者核心",
  "tags": "Auth"          "tags": "驗證"
}                       }

The manifest splits on "," and space-trims each tag → tagLabels: { "en-US": ["Auth"], "zh-TW": ["驗證"] }. Multiple tags: "Auth, Payments" → ["Auth","Payments"].

No api-platform change — the map flows through verbatim as JSONB, the same path NameLabels / descriptionLabels already use.

Tests

• i18n.LookupList: splits/trims/drops-empties; missing key → empty map (no raw-key fallback).
• Manifest end-to-end: a module registering module.name + module.tags surfaces nameLabels + tagLabels per-locale; a module with neither leaves both absent (raw Name/Tags fallback).

go build ./... + go vet ./... + go test ./... all green.

Consumer (separate, uncommitted)

ms-app-modules/oauth-core authors module.tags (en-US Auth, zh-TW 驗證) in its catalog — no main.go change needed since tags resolve from the catalog like NameLabels. Verified it compiles against this branch via a temp GOWORK.

Rollout note: the runner's mounted SDK (app-module-sdk-wt-lambda-shim) must include this commit before oauth-core rebuilds — the main session handles that.

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