feat(spec): model action-param translations in TranslationData (_actions.params)

Action labels localize via `objects.<obj>._actions.<action>.label` bundle keys,
but action PARAMS (the dialog form fields) had no translation path — the
`_actions` translation schema only modeled label/confirmText/successMessage, so
a param's label/helpText/placeholder/options could not be localized and rendered
English in a zh UI.

Add an optional `params` record to the action translation schema (in
ObjectTranslationDataSchema._actions, globalActions, and the secondary
ObjectTranslationNodeSchema._actions):

  _actions.<action>.params.<param>.{ label?, helpText?, placeholder?, options? }

`options` maps a select value → translated label. All optional and additive, so
existing bundles are unaffected. objectui's `useObjectLabel().actionParamText()`
already reads this exact key path; this unblocks authoring the bundle entries.

Tests: 1149 spec tests pass (translation/i18n-resolver/typegen); DTS build green.

Author: os-zhuang

packages/spec/src/system/translation.zod.ts

@@ -79,6 +79,12 @@ export const ObjectTranslationDataSchema = lazySchema(() => z.object({
     label: z.string().optional().describe('Translated action label'),
     confirmText: z.string().optional().describe('Translated confirmation prompt'),
     successMessage: z.string().optional().describe('Translated success toast/message'),
+    params: z.record(z.string(), z.object({
+      label: z.string().optional().describe('Translated action parameter label'),
+      helpText: z.string().optional().describe('Translated action parameter help/hint text'),
+      placeholder: z.string().optional().describe('Translated action parameter placeholder'),
+      options: z.record(z.string(), z.string()).optional().describe('Param select option value to translated label'),
+    })).optional().describe('Action parameter translations keyed by parameter name'),
   })).optional().describe('Action translations keyed by action name'),
 
   /**
@@ -145,6 +151,12 @@ export const TranslationDataSchema = lazySchema(() => z.object({
     label: z.string().optional().describe('Translated action label'),
     confirmText: z.string().optional().describe('Translated confirmation prompt'),
     successMessage: z.string().optional().describe('Translated success toast/message'),
+    params: z.record(z.string(), z.object({
+      label: z.string().optional().describe('Translated action parameter label'),
+      helpText: z.string().optional().describe('Translated action parameter help/hint text'),
+      placeholder: z.string().optional().describe('Translated action parameter placeholder'),
+      options: z.record(z.string(), z.string()).optional().describe('Param select option value to translated label'),
+    })).optional().describe('Action parameter translations keyed by parameter name'),
   })).optional().describe('Global action translations keyed by action name'),
 
   /**
@@ -466,6 +478,12 @@ export const ObjectTranslationNodeSchema = lazySchema(() => z.object({
   _actions: z.record(z.string(), z.object({
     label: z.string().optional().describe('Translated action label'),
     confirmMessage: z.string().optional().describe('Translated confirmation message'),
+    params: z.record(z.string(), z.object({
+      label: z.string().optional().describe('Translated action parameter label'),
+      helpText: z.string().optional().describe('Translated action parameter help/hint text'),
+      placeholder: z.string().optional().describe('Translated action parameter placeholder'),
+      options: z.record(z.string(), z.string()).optional().describe('Param select option value to translated label'),
+    })).optional().describe('Action parameter translations keyed by parameter name'),
   })).optional().describe('Action translations keyed by action name'),
 
   /** Notification message translations keyed by notification name */