Rebrand the entire application from "胡萝卜社区" (Carrot BBS) to "威友" (WithYou), including:

- Update app name, package name (skin.carrot.bbs → cn.qczlit.withyou), and bundle identifier
- Update API endpoints (bbs.littlelan.cn → withyou.littlelan.cn)
- Update URL scheme (carrotbbs:// → withyou://)
- Rename database from carrot_bbs to with_you
- Update CI/CD pipeline image names and artifact naming
- Add Android signing configuration for release builds
- Update all UI text and comments throughout the codebase
- Refactor registerStore to use in-memory state instead of AsyncStorage persistence
- Improve WebRTC track handling and call stream management
- Add metro platform resolution for native platform support

BREAKING app package, database, and URLs are no longer valid

src/components/business/QRCodeScanner.tsx

@@ -221,7 +221,7 @@ const QRCodeScannerNative: React.FC<QRCodeScannerProps> = ({ visible, onClose })
     setScanned(true);
     onClose();
 
-    if (data.startsWith('carrotbbs://qrcode/login')) {
+    if (data.startsWith('withyou://qrcode/login')) {
       const sessionId = extractSessionId(data);
       if (sessionId) {
         router.push(hrefs.hrefQrLoginConfirm(sessionId));

src/components/business/ShareSheet/ShareSheet.tsx

@@ -1,4 +1,4 @@
-import React, { useEffect, useMemo } from 'react';
+import React, { useEffect, useMemo } from 'react';
 import { Share as RNShare, Platform } from 'react-native';
 
 export interface ShareSheetProps {
@@ -18,7 +18,7 @@ const ShareSheet: React.FC<ShareSheetProps> = ({
 }) => {
 
   const shareText = useMemo(() => {
-    const title = postTitle || '胡萝卜BBS帖子';
+    const title = postTitle || '威友帖子';
     return `${title} ${postUrl || ''}`;
   }, [postTitle, postUrl]);
 

src/components/common/ImageGallery.tsx

@@ -218,7 +218,7 @@ export const ImageGallery: React.FC<ImageGalleryProps> = ({
       const allowedExts = ['jpg', 'jpeg', 'png', 'gif', 'webp'];
       const fileExt = allowedExts.includes(ext) ? ext : 'jpg';
 
-      const fileName = `carrot_${Date.now()}.${fileExt}`;
+      const fileName = `withyou_${Date.now()}.${fileExt}`;
       const destination = new File(Paths.cache, fileName);
 
       // File.downloadFileAsync 是新版 expo-file-system/next 的静态方法

src/components/common/PagerView.web.tsx

@@ -7,11 +7,18 @@ type PagerViewProps = {
   onPageSelected?: (e: { nativeEvent: { position: number } }) => void;
   overdrag?: boolean;
   children: React.ReactNode;
+  testID?: string;
+};
+
+type PagerViewRef = {
+  setPage: (page: number) => void;
+  setPageWithoutAnimation: (page: number) => void;
+  setScrollEnabled: (scrollEnabled: boolean) => void;
 };
 
 function PagerViewInternal(
   { style, children }: PagerViewProps,
-  _ref: ForwardedRef<{ setPage: (page: number) => void }>
+  _ref: ForwardedRef<PagerViewRef>
 ) {
   const childrenArray = React.Children.toArray(children);
   return (