feat: add project profiles for snapshot-based config switching

Add a profile feature that captures the current provider, MCP,
skills and prompt state for Claude Code and Codex as a named
snapshot, and re-applies it in one click from the header switcher
or the tray Projects submenu.

- New profiles table (schema v12) with current marker in settings
- ProfileService orchestrates the four existing switch primitives
  (provider first, then MCP diff, skills diff, prompt enable)
- Best-effort apply: dangling references become warnings, no rollback
- Header combobox switcher + snapshot-style manage dialog
- Tray Projects submenu shared with the UI apply/event pipeline
- i18n for zh/en/ja/zh-TW under the new profiles domain
- Integration tests covering roundtrip, dangling refs and clear

src/components/prompts/PromptPanel.tsx

@@ -3,6 +3,7 @@ import { useTranslation } from "react-i18next";
 import { FileText } from "lucide-react";
 import { type AppId } from "@/lib/api";
 import { usePromptActions } from "@/hooks/usePromptActions";
+import { useTauriEvent } from "@/hooks/useTauriEvent";
 import PromptListItem from "./PromptListItem";
 import PromptFormPanel from "./PromptFormPanel";
 import { ConfirmDialog } from "../ConfirmDialog";
@@ -59,6 +60,9 @@ const PromptPanel = React.forwardRef<PromptPanelHandle, PromptPanelProps>(
       };
     }, [appId, reload]);
 
+    // 应用项目 Profile 会切换激活的 prompt（prompts 非 react-query，需主动 reload）
+    useTauriEvent("profile-applied", reload);
+
     const handleAdd = () => {
       setEditingId(null);
       setIsFormOpen(true);