refactor: remove OMO common config two-layer merge system

Each OMO provider now stores its complete configuration directly in
settings_config.otherFields instead of relying on a shared OmoGlobalConfig
merged at write time. This simplifies the data flow from a 4-tuple
(agents, categories, otherFields, useCommonConfig) to a 3-tuple and
eliminates an entire DB table, two Tauri commands, and ~1700 lines of
merge/sync code across frontend and backend.

Backend:
- Delete database/dao/omo.rs (OmoGlobalConfig struct + get/save methods)
- Remove get/set_config_snippet from settings DAO
- Remove get/set_common_config_snippet Tauri commands
- Replace merge_config() with build_config() in services/omo.rs
- Simplify OmoVariant (remove config_key, known_keys)
- Simplify import_from_local and build_local_file_data
- Rewrite all OMO service tests

Frontend:
- Delete OmoCommonConfigEditor.tsx and OmoGlobalConfigFields.tsx
- Delete src/lib/api/config.ts
- Remove OmoGlobalConfig type and merge preview functions
- Remove useGlobalConfig/useSaveGlobalConfig query hooks
- Simplify useOmoDraftState (remove all common config state)
- Replace OmoCommonConfigEditor with read-only JsonEditor preview
- Clean i18n keys (zh/en/ja)

src/components/providers/forms/hooks/useOmoDraftState.ts

@@ -1,22 +1,11 @@
-import { useState, useCallback, useEffect, useRef, useMemo } from "react";
-import { useTranslation } from "react-i18next";
-import { toast } from "sonner";
-import type { OmoGlobalConfig } from "@/types/omo";
+import { useState, useCallback, useMemo } from "react";
 import {
-  mergeOmoConfigPreview,
-  mergeOmoSlimConfigPreview,
   buildOmoSlimProfilePreview,
-} from "@/types/omo";
-import { type OmoGlobalConfigFieldsRef } from "../OmoGlobalConfigFields";
-import * as configApi from "@/lib/api/config";
-import {
-  EMPTY_OMO_GLOBAL_CONFIG,
   buildOmoProfilePreview,
-} from "../helpers/opencodeFormUtils";
+} from "@/types/omo";
 
 interface UseOmoDraftStateParams {
   initialOmoSettings: Record<string, unknown> | undefined;
-  queriedOmoGlobalConfig: OmoGlobalConfig | undefined;
   isEditMode: boolean;
   appId: string;
   category?: string;
@@ -33,33 +22,15 @@ export interface OmoDraftState {
   >;
   omoOtherFieldsStr: string;
   setOmoOtherFieldsStr: React.Dispatch<React.SetStateAction<string>>;
-  useOmoCommonConfig: boolean;
-  setUseOmoCommonConfig: React.Dispatch<React.SetStateAction<boolean>>;
-  isOmoConfigModalOpen: boolean;
-  setIsOmoConfigModalOpen: React.Dispatch<React.SetStateAction<boolean>>;
-  isOmoSaving: boolean;
-  omoGlobalConfigRef: React.RefObject<OmoGlobalConfigFieldsRef | null>;
-  omoFieldsKey: number;
-  effectiveOmoGlobalConfig: OmoGlobalConfig;
   mergedOmoJsonPreview: string;
-  handleOmoGlobalConfigSave: () => Promise<void>;
-  handleOmoEditClick: () => void;
-  resetOmoDraftState: (useCommonConfig?: boolean) => void;
-  setOmoGlobalState: React.Dispatch<
-    React.SetStateAction<OmoGlobalConfig | null>
-  >;
+  resetOmoDraftState: () => void;
 }
 
 export function useOmoDraftState({
   initialOmoSettings,
-  queriedOmoGlobalConfig,
-  isEditMode,
-  appId,
   category,
 }: UseOmoDraftStateParams): OmoDraftState {
-  const { t } = useTranslation();
   const isSlim = category === "omo-slim";
-  const commonConfigKey = isSlim ? "omo_slim" : "omo";
 
   const [omoAgents, setOmoAgents] = useState<
     Record<string, Record<string, unknown>>
@@ -82,118 +53,25 @@ export function useOmoDraftState({
     return otherFields ? JSON.stringify(otherFields, null, 2) : "";
   });
 
-  const [omoGlobalState, setOmoGlobalState] = useState<OmoGlobalConfig | null>(
-    null,
-  );
-
-  const [isOmoConfigModalOpen, setIsOmoConfigModalOpen] = useState(false);
-  const [useOmoCommonConfig, setUseOmoCommonConfig] = useState(() => {
-    const raw = initialOmoSettings?.useCommonConfig;
-    return typeof raw === "boolean" ? raw : true;
-  });
-  const [isOmoSaving, setIsOmoSaving] = useState(false);
-  const omoGlobalConfigRef = useRef<OmoGlobalConfigFieldsRef>(null);
-  const [omoFieldsKey, setOmoFieldsKey] = useState(0);
-  const effectiveOmoGlobalConfig =
-    omoGlobalState ?? queriedOmoGlobalConfig ?? EMPTY_OMO_GLOBAL_CONFIG;
-
   const mergedOmoJsonPreview = useMemo(() => {
-    if (useOmoCommonConfig) {
-      if (isSlim) {
-        const merged = mergeOmoSlimConfigPreview(
-          effectiveOmoGlobalConfig,
-          omoAgents,
-          omoOtherFieldsStr,
-        );
-        return JSON.stringify(merged, null, 2);
-      }
-      const merged = mergeOmoConfigPreview(
-        effectiveOmoGlobalConfig,
-        omoAgents,
-        omoCategories,
-        omoOtherFieldsStr,
-      );
-      return JSON.stringify(merged, null, 2);
-    } else {
-      if (isSlim) {
-        return JSON.stringify(
-          buildOmoSlimProfilePreview(omoAgents, omoOtherFieldsStr),
-          null,
-          2,
-        );
-      }
+    if (isSlim) {
       return JSON.stringify(
-        buildOmoProfilePreview(omoAgents, omoCategories, omoOtherFieldsStr),
+        buildOmoSlimProfilePreview(omoAgents, omoOtherFieldsStr),
         null,
         2,
       );
     }
-  }, [
-    useOmoCommonConfig,
-    effectiveOmoGlobalConfig,
-    omoAgents,
-    omoCategories,
-    omoOtherFieldsStr,
-    isSlim,
-  ]);
+    return JSON.stringify(
+      buildOmoProfilePreview(omoAgents, omoCategories, omoOtherFieldsStr),
+      null,
+      2,
+    );
+  }, [omoAgents, omoCategories, omoOtherFieldsStr, isSlim]);
 
-  // Auto-detect whether common config has content for new OMO/OMO Slim profiles
-  useEffect(() => {
-    if (
-      appId !== "opencode" ||
-      (category !== "omo" && category !== "omo-slim") ||
-      isEditMode
-    )
-      return;
-    let active = true;
-    (async () => {
-      let next = false;
-      try {
-        const raw = await configApi.getCommonConfigSnippet(commonConfigKey);
-        if (raw) {
-          const parsed = JSON.parse(raw) as Record<string, unknown>;
-          next = Object.keys(parsed).some(
-            (k) => k !== "id" && k !== "updatedAt",
-          );
-        }
-      } catch {}
-      if (active) setUseOmoCommonConfig(next);
-    })();
-    return () => {
-      active = false;
-    };
-  }, [appId, category, isEditMode, commonConfigKey]);
-
-  const handleOmoGlobalConfigSave = useCallback(async () => {
-    if (!omoGlobalConfigRef.current) return;
-    setIsOmoSaving(true);
-    try {
-      const config = omoGlobalConfigRef.current.buildCurrentConfigStrict();
-      await configApi.setCommonConfigSnippet(
-        commonConfigKey,
-        JSON.stringify(config),
-      );
-      setIsOmoConfigModalOpen(false);
-      toast.success(
-        t("omo.globalConfigSaved", { defaultValue: "Global config saved" }),
-      );
-    } catch (err) {
-      toast.error(String(err));
-    } finally {
-      setIsOmoSaving(false);
-    }
-  }, [t, commonConfigKey]);
-
-  const handleOmoEditClick = useCallback(() => {
-    setOmoFieldsKey((k) => k + 1);
-    setIsOmoConfigModalOpen(true);
-  }, []);
-
-  const resetOmoDraftState = useCallback((useCommonConfig = true) => {
+  const resetOmoDraftState = useCallback(() => {
     setOmoAgents({});
     setOmoCategories({});
     setOmoOtherFieldsStr("");
-    setUseOmoCommonConfig(useCommonConfig);
   }, []);
 
   return {
@@ -203,18 +81,7 @@ export function useOmoDraftState({
     setOmoCategories,
     omoOtherFieldsStr,
     setOmoOtherFieldsStr,
-    useOmoCommonConfig,
-    setUseOmoCommonConfig,
-    isOmoConfigModalOpen,
-    setIsOmoConfigModalOpen,
-    isOmoSaving,
-    omoGlobalConfigRef,
-    omoFieldsKey,
-    effectiveOmoGlobalConfig,
     mergedOmoJsonPreview,
-    handleOmoGlobalConfigSave,
-    handleOmoEditClick,
     resetOmoDraftState,
-    setOmoGlobalState,
   };
 }