chore: bump version to v3.7.1

Prepare for v3.7.1 maintenance release.

**Version Updates**:
- package.json: 3.7.0 → 3.7.1
- src-tauri/Cargo.toml: 3.7.0 → 3.7.1
- src-tauri/tauri.conf.json: 3.7.0 → 3.7.1
- README.md: version badge updated
- README_ZH.md: version badge updated

**CHANGELOG.md**:
- Added v3.7.1 release notes (2025-11-22)
- 3 bug fixes (Skills installation, Gemini persistence, dialog overlay)
- 2 new features (Gemini config directory, ArchLinux support)
- 3 improvements (error i18n, download timeout, code formatting)
- 1 reverted feature (auto-launch)

**Code Formatting**:
- Applied prettier to SkillsPage.tsx and skillErrorParser.ts

**Pre-Release Checks**:
✅ TypeScript type check passed
✅ Prettier format check passed
✅ All version numbers synchronized

src/components/skills/SkillsPage.tsx

@@ -35,7 +35,7 @@ export function SkillsPage({ onClose: _onClose }: SkillsPageProps = {}) {
       const { title, description } = formatSkillError(
         errorMessage,
         t,
-        "skills.loadFailed"
+        "skills.loadFailed",
       );
 
       toast.error(title, {
@@ -75,7 +75,7 @@ export function SkillsPage({ onClose: _onClose }: SkillsPageProps = {}) {
       const { title, description } = formatSkillError(
         errorMessage,
         t,
-        "skills.installFailed"
+        "skills.installFailed",
       );
 
       toast.error(title, {
@@ -105,7 +105,7 @@ export function SkillsPage({ onClose: _onClose }: SkillsPageProps = {}) {
       const { title, description } = formatSkillError(
         errorMessage,
         t,
-        "skills.uninstallFailed"
+        "skills.uninstallFailed",
       );
 
       toast.error(title, {