feat(i18n): add toast i18n with en/zh locale and plugin config support

- Add src/locales/ with en baseline and zh overrides (Partial<Record> fallback)
- Add src/shared/i18n.ts with initI18n/t/setLocale/getLocale (LANG env auto-detect)
- Add I18nConfigSchema with locale field to plugin config
- Internationalize 13 hardcoded strings in task-toast-manager
- Add 18 unit tests for i18n module
- Pin manager tests to en locale for determinism

src/config/index.ts

@@ -6,6 +6,7 @@ export type {
   OhMyOpenCodeConfig,
   AgentOverrideConfig,
   AgentOverrides,
+  I18nConfig,
   McpName,
   AgentName,
   HookName,

src/config/schema.ts

@@ -13,6 +13,7 @@ export * from "./schema/fallback-models"
 export * from "./schema/git-env-prefix"
 export * from "./schema/git-master"
 export * from "./schema/hooks"
+export * from "./schema/i18n"
 export * from "./schema/keyword-detector"
 export * from "./schema/model-capabilities"
 export * from "./schema/notification"

src/config/schema/i18n.ts

@@ -0,0 +1,8 @@
+import { z } from "zod"
+
+export const I18nConfigSchema = z.object({
+  /** Override auto-detected locale (e.g. "en", "zh"). Falls back to LANG env var if not set. */
+  locale: z.string().optional(),
+})
+
+export type I18nConfig = z.infer<typeof I18nConfigSchema>

src/config/schema/oh-my-opencode-config.ts

@@ -12,6 +12,7 @@ import { CommentCheckerConfigSchema } from "./comment-checker"
 import { BuiltinCommandNameSchema } from "./commands"
 import { ExperimentalConfigSchema } from "./experimental"
 import { GitMasterConfigSchema } from "./git-master"
+import { I18nConfigSchema } from "./i18n"
 import { KeywordDetectorConfigSchema } from "./keyword-detector"
 import { NotificationConfigSchema } from "./notification"
 import { OpenClawConfigSchema } from "./openclaw"
@@ -67,6 +68,8 @@ export const OhMyOpenCodeConfigSchema = z.object({
   notification: NotificationConfigSchema.optional(),
   model_capabilities: ModelCapabilitiesConfigSchema.optional(),
   openclaw: OpenClawConfigSchema.optional(),
+  /** Plugin i18n settings */
+  i18n: I18nConfigSchema.optional(),
   team_mode: TeamModeConfigSchema.optional(),
   /** Per-keyword disable list for the keyword-detector transform hook. Allowed values: "ultrawork", "search", "analyze", "team". */
   keyword_detector: KeywordDetectorConfigSchema.optional(),