feat(prompts+i18n): add prompt management and improve prompt editor i18n (#193)

* feat(prompts): add prompt management across Tauri service and React UI

- backend: add commands/prompt.rs, services/prompt.rs, register in commands/mod.rs and lib.rs, refine app_config.rs
- frontend: add PromptPanel, PromptFormModal, PromptListItem, MarkdownEditor, usePromptActions, integrate in App.tsx
- api: add src/lib/api/prompts.ts
- i18n: update src/i18n/locales/{en,zh}.json
- build: update package.json and pnpm-lock.yaml

* feat(i18n): improve i18n for prompts and Markdown editor

- update src/i18n/locales/{en,zh}.json keys and strings
- apply i18n in PromptFormModal, PromptPanel, and MarkdownEditor
- align prompt text with src-tauri/src/services/prompt.rs

* feat(prompts): add enable/disable toggle and simplify panel UI

- Add PromptToggle component and integrate in prompt list items
- Implement toggleEnabled with optimistic update; enable via API, disable via upsert with enabled=false;
  reload after success
- Simplify PromptPanel: remove file import and current-file preview to keep CRUD flow focused
- Tweak header controls style (use mcp variant) and minor copy: rename “Prompt Management” to “Prompts”
- i18n: add disableSuccess/disableFailed messages
- Backend (Tauri): prevent duplicate backups when importing original prompt content

* style: unify code formatting with trailing commas

* feat(prompts): add Gemini filename support to PromptFormModal

Update filename mapping to use Record<AppId, string> pattern, supporting
GEMINI.md alongside CLAUDE.md and AGENTS.md.

* fix(prompts): sync enabled prompt to file when updating

When updating a prompt that is currently enabled, automatically sync
the updated content to the corresponding live file (CLAUDE.md/AGENTS.md/GEMINI.md).

This ensures the active prompt file always reflects the latest content
when editing enabled prompts.

src/App.tsx

@@ -21,6 +21,7 @@ import { SettingsDialog } from "@/components/settings/SettingsDialog";
 import { UpdateBadge } from "@/components/UpdateBadge";
 import UsageScriptModal from "@/components/UsageScriptModal";
 import McpPanel from "@/components/mcp/McpPanel";
+import PromptPanel from "@/components/prompts/PromptPanel";
 import { Button } from "@/components/ui/button";
 
 function App() {
@@ -31,6 +32,7 @@ function App() {
   const [isSettingsOpen, setIsSettingsOpen] = useState(false);
   const [isAddOpen, setIsAddOpen] = useState(false);
   const [isMcpOpen, setIsMcpOpen] = useState(false);
+  const [isPromptOpen, setIsPromptOpen] = useState(false);
   const [editingProvider, setEditingProvider] = useState<Provider | null>(null);
   const [usageProvider, setUsageProvider] = useState<Provider | null>(null);
   const [confirmDelete, setConfirmDelete] = useState<Provider | null>(null);
@@ -202,6 +204,13 @@ function App() {
 
           <div className="flex flex-wrap items-center gap-2">
             <AppSwitcher activeApp={activeApp} onSwitch={setActiveApp} />
+            <Button
+              variant="mcp"
+              onClick={() => setIsPromptOpen(true)}
+              className="min-w-[80px]"
+            >
+              {t("prompts.manage")}
+            </Button>
             <Button
               variant="mcp"
               onClick={() => setIsMcpOpen(true)}
@@ -287,6 +296,12 @@ function App() {
         onImportSuccess={handleImportSuccess}
       />
 
+      <PromptPanel
+        open={isPromptOpen}
+        onOpenChange={setIsPromptOpen}
+        appId={activeApp}
+      />
+
       <McpPanel
         open={isMcpOpen}
         onOpenChange={setIsMcpOpen}